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tan(x1+x2)/2=sin(x1+x2)/1+cos(x1+x2)怎么算出来的
人气:270 ℃ 时间:2020-10-02 02:53:33
解答
记x1+x2=a
sin(x1+x2)/1+cos(x1+x2)=sina/(1+cosa)=2sin(a/2)cos(a/2)/(2cosa^2)
=tan(a/2)=tan(x1+x2)/2
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