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数学
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已知f(sina+cosa)=sinacosa,求f(cos30°)的值
人气:295 ℃ 时间:2020-04-16 18:58:52
解答
sina+cosa=t
f(t)=(t^2-1)/2
f(cos30°)=(1/3-1)/2
=-(2/3)/2
=-1/3
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