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

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

User Astrit Spanca
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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
User Duburcqa
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