sina+cosa=t
f(t)=(t^2-1)/2
f(cos30°)=(1/3-1)/2
=-(2/3)/2
=-1/3
已知f(sina+cosa)=sinacosa,求f(cos30°)的值
已知f(sina+cosa)=sinacosa,求f(cos30°)的值
数学人气：387 ℃时间：2020-04-16 18:58:52
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