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20 December, 04:47

Express cos^2x in terms of cos2x

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  1. 20 December, 05:12
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    Cos 2x = cos^2 x - sin^2 x

    cos^2 x = 1 - sin^2 x

    cos 2x = 1 - 2 sin^2 x

    sin^2 x = 1/2 (1 - cos 2x)
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