Last updated at Feb. 13, 2020 by Teachoo
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Example 21 Solve cos ๐ฅ = 1/2 Let cos x = cos y Given cos x = 1/2 From (1) and (2) cos y = 1/2 cos y = cos ๐/3 y = ๐/3 Rough We know that cos 60ยฐ = 1/2 So, 60ยฐ = 60 ร ฯ/180 = ฯ/3 Since cos x = cos y General Solution is x = 2nฯ ยฑ y where n โ Z Putting y = ๐/3 x = 2nฯ ยฑ๐ /๐ where n โ Z
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