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3 January, 21:10

Evaluate the expression using an appropriate double angle formula ... cos^2 (15) - sin^2 (15)

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  1. 3 January, 21:33
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    Cos² (15°) - sin² (15°) = cos (15° * 2) = √ (3/2 so this is the answer by using apropriate formula double angle identity
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