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Write cos^4x as an equivalent expression that does not contain powers of trigonomretric functions greater than 1

Write cos^4x as an equivalent expression that does not contain powers of trigonomretric functions greater than 1
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Write cos^4x as an equivalent expression that does not contain powers of trigonomretric functions greater than 1

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User Nobi
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cos^{4}x [/tex] =
cos^(2)x.cos{2}x = (cos2x+1)(cos2x+1)/4

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User Breandan
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