{"id":9410,"date":"2022-01-12T02:39:03","date_gmt":"2022-01-11T21:09:03","guid":{"rendered":"https:\/\/mathemerize.com\/?p=9410"},"modified":"2022-01-12T02:58:37","modified_gmt":"2022-01-11T21:28:37","slug":"what-is-the-value-of-cos-36-degrees","status":"publish","type":"post","link":"https:\/\/mathemerize.com\/what-is-the-value-of-cos-36-degrees\/","title":{"rendered":"What is the Value of Cos 36 Degrees ?"},"content":{"rendered":"

Solution :<\/h2>\n

The value of cos 36 degrees<\/strong> is \\(\\sqrt{5} + 1\\over 4\\)<\/strong>.<\/p>\n

Proof :<\/strong><\/p>\n

We know that the value sin 18 degrees<\/a> is \\(\\sqrt{5} – 1\\over 4\\).<\/p>\n

We have, \\(cos 2\\theta\\) = \\(1 – 2 sin^2 \\theta\\)<\/p>\n

\\(\\therefore\\)\u00a0 \u00a0cos 36 = 1 – \\(2 sin^2 18\\)<\/p>\n

\\(\\implies\\)\u00a0 cos 36 = 1 – 2\\(({\\sqrt{5} – 1\\over 4})^2\\) = \\(\\sqrt{5} + 1\\over 4\\)<\/p>\n

Hence, cos 36 degrees is \\(\\sqrt{5} + 1\\over 4\\).<\/p>\n","protected":false},"excerpt":{"rendered":"

Solution : The value of cos 36 degrees is \\(\\sqrt{5} + 1\\over 4\\). Proof : We know that the value sin 18 degrees is \\(\\sqrt{5} – 1\\over 4\\). We have, \\(cos 2\\theta\\) = \\(1 – 2 sin^2 \\theta\\) \\(\\therefore\\)\u00a0 \u00a0cos 36 = 1 – \\(2 sin^2 18\\) \\(\\implies\\)\u00a0 cos 36 = 1 – 2\\(({\\sqrt{5} – …<\/p>\n

What is the Value of Cos 36 Degrees ?<\/span> Read More »<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-global-header-display":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":""},"categories":[43,60],"tags":[],"yoast_head":"\nWhat is the Value of Cos 36 Degrees ? - Mathemerize<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/mathemerize.com\/what-is-the-value-of-cos-36-degrees\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"What is the Value of Cos 36 Degrees ? - Mathemerize\" \/>\n<meta property=\"og:description\" content=\"Solution : The value of cos 36 degrees is (sqrt{5} + 1over 4). Proof : We know that the value sin 18 degrees is (sqrt{5} – 1over 4). We have, (cos 2theta) = (1 – 2 sin^2 theta) (therefore)\u00a0 \u00a0cos 36 = 1 – (2 sin^2 18) (implies)\u00a0 cos 36 = 1 – 2(({sqrt{5} – … What is the Value of Cos 36 Degrees ? 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