Write the expression as the sine, cosine, or tangent of adouble angle. Then find the exact value of the expression. cos^2 15-sin^2 15

beatricalwu

beatricalwu

Answered question

2022-07-25

Write the expression as the sine, cosine, or tangent of adouble angle. Then find the exact value of the expression.
cos 2 15 sin 2 15

Answer & Explanation

Rihanna Robles

Rihanna Robles

Beginner2022-07-26Added 18 answers

sin 2 x cos 2 x = cos ( 2 x )
therefore
sin 2 15 cos 2 15 = cos ( 2 15 ) = cos ( 30 ) = 3 2
Ibrahim Rosales

Ibrahim Rosales

Beginner2022-07-27Added 7 answers

Write the expression as the sine,cosine, or tangent of a double angle. Then find the exactvalue of the expression.
cos 2 15 sin 2 15 = 2 cos 30 = 2 1 2 3 = 3

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