help writing the expression in terms of first powers of cosine Write the expression in terms...

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Question

help writing the expression in terms of first powers of cosine

math trigonometry

Answer 1

Answer #1

sin^4x = (sin^2x)^2

= (1-cos^2x)^2

= 1 + cos^4x - 2cos^2x

= cos^4x - 2cos^2x + 1

Answer 2

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