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18 February, 17:58

Rewrite the expression as an equivalent expression that does not contain powers of trigonometric functions greater than 1.

cos^4 (x)

+4
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  1. 18 February, 19:04
    0
    Cos^4 (x) =

    (cos²x) ² =

    (1-sen²x) ² =

    1² - 2*1*sen²x + sen^4x =

    1 - 2sen²x + sen^4x
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