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数学
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若f(sinx)=cos2x,那么f(cosx)等于?
人气:371 ℃ 时间:2019-09-17 06:45:51
解答
f(sinx)=cos2x=1-2sin²x
∴ f(t)=1-2t²
∴ f(cosx)=1-2cos²x=-cos2x
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