3 years ago

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

Mathematics

1 answer:

riadik2000 [5.3K]3 years ago

7 0

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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