{"id":2482,"date":"2026-09-13T18:34:15","date_gmt":"2026-09-13T18:34:15","guid":{"rendered":"https:\/\/www.jrebsen.dk\/?post_type=aktivitet&#038;p=2482"},"modified":"2026-09-14T08:00:49","modified_gmt":"2026-09-14T08:00:49","slug":"afsluttende-om-cosinus-sinus-og-tangens","status":"publish","type":"aktivitet","link":"https:\/\/www.jrebsen.dk\/?aktivitet=afsluttende-om-cosinus-sinus-og-tangens","title":{"rendered":"Cosinus, sinus og tangens en sidste gang"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Intro (5 min)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Det skal du bruge:<\/strong>  KonteXt+ 9-bogen, Computer, Lommeregner, kladdeh\u00e6fte og skriveredskaber<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>\u00a0To hold:<\/strong> Sander, Villads, Line, Ivalo, Karla J, Karla G, Ida, Benjamin og Narmin g\u00e5r med Jens<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Introopgave &#8211; Hvilke af disse trekanter er rette?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">12, 16, 20 eller 12, 28, 36?<\/p>\n\n\n\n<figure class=\"wp-block-gallery has-nested-images columns-default is-cropped wp-block-gallery-1 is-layout-flex wp-block-gallery-is-layout-flex\">\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"241\" height=\"201\" data-id=\"2502\" src=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/image-10.png\" alt=\"\" class=\"wp-image-2502\"\/><\/figure>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" data-id=\"2505\" src=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/trekant.svg\" alt=\"\" class=\"wp-image-2505\"\/><\/figure>\n<\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">3-4-5-kants metoden &#8211; Hvad bruger t\u00f8mre Pytagoras til?<\/h3>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Matematik p\u00e5 arbejde - T\u00f8mrer: 3-4-5-kant\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/icboDScob4g?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Snak sammen to og to:  <\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Hvordan kan man bruge 3,4,5-reglen til at sikre at det man bygger er retvinklet?<\/li>\n\n\n\n<li>Hvor kan man bruge reglen?<\/li>\n\n\n\n<li>Hvorfor virker reglen? <\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-pullquote\"><blockquote><p>Pythagoras beskriver sammenh\u00e6ngen mellem trekantens tre sider. Sinus, cosinus og tangens beskriver forholdet mellem siderne og en bestemt vinkel.<\/p><\/blockquote><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Hvordan bruger man sinus, cosinus og tangende<\/h3>\n\n\n\n<figure class=\"wp-block-image is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"515\" src=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-09-at-05.49.01-1024x515.png\" alt=\"\" class=\"wp-image-2412\" style=\"aspect-ratio:1.9883495145631067;width:1024px;height:auto\" srcset=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-09-at-05.49.01-1024x515.png 1024w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-09-at-05.49.01-300x151.png 300w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-09-at-05.49.01-768x386.png 768w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-09-at-05.49.01.png 1484w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><semantics><mrow><mi>sin<\/mi><mo>\u2061<\/mo><mo stretchy=\"false\">(<\/mo><mi>A<\/mi><mo stretchy=\"false\">)<\/mo><mo>=<\/mo><mfrac><mrow><mtext>modst<\/mtext><mover accent=\"true\"><mtext>a<\/mtext><mo>\u02da<\/mo><\/mover><mtext>ende&nbsp;katete<\/mtext><\/mrow><mtext>hypotenusen<\/mtext><\/mfrac><\/mrow><\/semantics><\/math><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><semantics><mrow><mi>cos<\/mi><mo>\u2061<\/mo><mo stretchy=\"false\">(<\/mo><mi>A<\/mi><mo stretchy=\"false\">)<\/mo><mo>=<\/mo><mfrac><mtext>hosliggende&nbsp;katete<\/mtext><mtext>hypotenusen<\/mtext><\/mfrac><\/mrow><\/semantics><\/math><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><semantics><mrow><\/mrow><\/semantics><\/math><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/app.skoledu.dk\/opgaver\/udskoling\/plane-figurer\/forloeb\/trigonometri\/cosinus-sinus-og-tangens-0\">https:\/\/app.skoledu.dk\/opgaver\/udskoling\/plane-figurer\/forloeb\/trigonometri\/cosinus-sinus-og-tangens-0<\/a><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Regneregler og formler <\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">KonteXt+9 s. 23<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"854\" height=\"1024\" src=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-06.28.40-854x1024.png\" alt=\"\" class=\"wp-image-2504\" srcset=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-06.28.40-854x1024.png 854w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-06.28.40-250x300.png 250w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-06.28.40-767x920.png 767w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-06.28.40-1281x1536.png 1281w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-06.28.40-1708x2048.png 1708w\" sizes=\"auto, (max-width: 854px) 100vw, 854px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Formelsamling s. 43<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"1024\" src=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/IMG_3772-768x1024-1.jpg\" alt=\"\" class=\"wp-image-2510\" srcset=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/IMG_3772-768x1024-1.jpg 768w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/IMG_3772-225x300.jpg 225w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/IMG_3772-1152x1536.jpg 1152w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/IMG_3772-1536x2048.jpg 1536w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/IMG_3772-scaled.jpg 1920w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"474\" src=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-05.37.46-1024x474.png\" alt=\"\" class=\"wp-image-2494\" srcset=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-05.37.46-1024x474.png 1024w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-05.37.46-300x139.png 300w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-05.37.46-767x355.png 767w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-05.37.46-1536x711.png 1536w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-05.37.46.png 1846w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\">Regneregler og formler <\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">KonteXt+9 s. 23<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"283\" src=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-05.38.02-1024x283.png\" alt=\"\" class=\"wp-image-2495\" srcset=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-05.38.02-1024x283.png 1024w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-05.38.02-300x83.png 300w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-05.38.02-767x212.png 767w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-05.38.02-1536x425.png 1536w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-05.38.02.png 1844w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Tangens<\/h3>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"469\" height=\"215\" src=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/image-8.png\" alt=\"\" class=\"wp-image-2498\" srcset=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/image-8.png 469w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/image-8-300x138.png 300w\" sizes=\"auto, (max-width: 469px) 100vw, 469px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-image aligncenter size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"231\" height=\"217\" src=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/image-7.png\" alt=\"\" class=\"wp-image-2497\" style=\"width:343px;height:auto\"\/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><math xmlns=\"http:\/\/www.w3.org\/1998\/Math\/MathML\" display=\"block\"><semantics><mrow><mi>tan<\/mi><mo>\u2061<\/mo><mo stretchy=\"false\">(<\/mo><mi>A<\/mi><mo stretchy=\"false\">)<\/mo><mo>=<\/mo><mfrac><mrow><mtext>modst<\/mtext><mover accent=\"true\"><mtext>a<\/mtext><mo>\u02da<\/mo><\/mover><mtext>ende&nbsp;katete<\/mtext><\/mrow><mtext>hosliggende&nbsp;katete<\/mtext><\/mfrac><\/mrow><\/semantics><\/math><\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Trekant<\/h3>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><img decoding=\"async\" src=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/trekant.svg\" alt=\"\" class=\"wp-image-2505\" style=\"aspect-ratio:1.198632266086416;width:573px;height:auto\"\/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Regneregler og formler <\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">KonteXt+9 s. 23<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"568\" src=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-05.38.39-1024x568.png\" alt=\"\" class=\"wp-image-2496\" srcset=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-05.38.39-1024x568.png 1024w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-05.38.39-300x166.png 300w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-05.38.39-768x426.png 768w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-05.38.39-1536x852.png 1536w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/Screenshot-2026-09-14-at-05.38.39.png 1838w\" sizes=\"auto, (max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Individuelt arbejde<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>SkoleDu.dk: opg. &#8216;Cosinus og Sinus&#8217;<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>KonteXt+9 s.27 Opg. 24<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Aftal med l\u00e6reren hvor du arbejder inden du forlader din plads<\/p>\n\n\n\n<figure class=\"wp-block-image is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"405\" src=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/image-5.png\" alt=\"\" class=\"wp-image-2413\" style=\"aspect-ratio:1.7777777777777777;width:720px;height:auto\" srcset=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/image-5.png 720w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/image-5-300x169.png 300w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Milep\u00e6le for det selvst\u00e6ndige arbejde<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Start:<\/strong>&nbsp;Skriv, hvilke opgaver du vil n\u00e5.<\/li>\n\n\n\n<li><strong>Undervejs:<\/strong>&nbsp;Vis og forklar mindst \u00e9n l\u00f8st opgave.<\/li>\n\n\n\n<li><strong>Afslutning:<\/strong>&nbsp;Not\u00e9r, hvor langt du n\u00e5ede, og hvilken opgave du starter med n\u00e6ste gang.<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Problem- og f\u00e6rdighedsregning<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">FP9 December 2023<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Aflevering torsdag d. 8. oktober<\/p>\n\n\n\n<figure class=\"wp-block-image is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"720\" height=\"405\" src=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/image-5.png\" alt=\"\" class=\"wp-image-2413\" style=\"aspect-ratio:1.7777777777777777;width:720px;height:auto\" srcset=\"https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/image-5.png 720w, https:\/\/www.jrebsen.dk\/wp-content\/uploads\/2026\/09\/image-5-300x169.png 300w\" sizes=\"auto, (max-width: 720px) 100vw, 720px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Intro (5 min) Det skal du bruge: KonteXt+ 9-bogen, Computer, Lommeregner, kladdeh\u00e6fte og skriveredskaber \u00a0To hold: Sander, Villads, Line, Ivalo, Karla J, Karla G, Ida, Benjamin og Narmin g\u00e5r med Jens Introopgave &#8211; Hvilke af disse trekanter er rette? 12, 16, 20 eller 12, 28, 36? 3-4-5-kants metoden &#8211; Hvad bruger t\u00f8mre Pytagoras til? Snak [&hellip;]<\/p>\n","protected":false},"featured_media":0,"menu_order":0,"template":"","meta":[],"categories":[],"tags":[],"aktivitetstype":[],"elementrolle":[],"fag":[90],"fagomraade":[144],"produkt":[],"class_list":["post-2482","aktivitet","type-aktivitet","status-publish","hentry","fag-matematik","fagomraade-trigonnometri"],"jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/www.jrebsen.dk\/index.php?rest_route=\/wp\/v2\/aktivitet\/2482","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.jrebsen.dk\/index.php?rest_route=\/wp\/v2\/aktivitet"}],"about":[{"href":"https:\/\/www.jrebsen.dk\/index.php?rest_route=\/wp\/v2\/types\/aktivitet"}],"wp:attachment":[{"href":"https:\/\/www.jrebsen.dk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2482"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.jrebsen.dk\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2482"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.jrebsen.dk\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2482"},{"taxonomy":"aktivitetstype","embeddable":true,"href":"https:\/\/www.jrebsen.dk\/index.php?rest_route=%2Fwp%2Fv2%2Faktivitetstype&post=2482"},{"taxonomy":"elementrolle","embeddable":true,"href":"https:\/\/www.jrebsen.dk\/index.php?rest_route=%2Fwp%2Fv2%2Felementrolle&post=2482"},{"taxonomy":"fag","embeddable":true,"href":"https:\/\/www.jrebsen.dk\/index.php?rest_route=%2Fwp%2Fv2%2Ffag&post=2482"},{"taxonomy":"fagomraade","embeddable":true,"href":"https:\/\/www.jrebsen.dk\/index.php?rest_route=%2Fwp%2Fv2%2Ffagomraade&post=2482"},{"taxonomy":"produkt","embeddable":true,"href":"https:\/\/www.jrebsen.dk\/index.php?rest_route=%2Fwp%2Fv2%2Fprodukt&post=2482"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}