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设f(sin(x/2))=1+cosx,求f(cosx)
人气:446 ℃ 时间:2020-05-14 03:24:34
解答

f[sin(x/2)]=1+cos x
=1+1-2[sin(x/2)]^2
=2-2[sin(x/2)]^2
f(cos x)=2-2(cos x)^2
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