cos 2A formula<\/a>,<\/p>\ncos 120 = \\(cos^2 60\\) – \\(sin^2 60\\) = \\(1\\over 4\\) – \\(3\\over 4\\)<\/p>\n
\\(\\implies\\)\u00a0 cos 120 = \\(-1\\over 2\\)<\/p>\n","protected":false},"excerpt":{"rendered":"
Solution : The value of cos 120 degrees is \\(-1\\over 2\\). Proof : We Know that sin 60 = \\(\\sqrt{3}\\over 2\\) and cos 60 = \\(1\\over 2\\) By using cos 2A formula, cos 120 = \\(cos^2 60\\) – \\(sin^2 60\\) = \\(1\\over 4\\) – \\(3\\over 4\\) \\(\\implies\\)\u00a0 cos 120 = \\(-1\\over 2\\)<\/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":"\n
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