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数学
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设f(sin x)=3-cos 2x,则f(cos x)=?
人气:137 ℃ 时间:2020-04-10 06:14:00
解答
f(sin x)
= 3 - cos 2x
= 3 - (1 - 2sin² x)
= 2sin²x + 2
所以 f(x) = 2x² + 2
所以 f(cos x) = 2cos² x + 2
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