Question

cos square 15 - cos square 75​

Answer 1

Answer:

Q. Evaluate cos²15 - cos²75

cos²15 - cos²75

cos²15 - sin² 90-75

cos²15 - sin²15

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Answer 2

Answer:

then it's value is -1

Explanation..

cos^2 15 - cos^2 (90 - 15)

cos^2 15 - sin^2 15

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