已知f(tana)=tan2a,则f(2)等于
已知f(tana)=tan2a,则f(2)等于
数学人气:822 ℃时间:2020-06-02 06:02:32
优质解答
tana=2,则二倍角公式有tan2a=(tana+tana)/(1-tana*tana)=-4/3
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