cosxsin(x-1)-sinxcos(1-x) - 知识问答

cosxsin(x-1)-sinxcos(1-x)等于多少?

6个回答

cosxsin(x-1)-sinxcos(1-x) :cos(1-x)=cos(x-1);因为cosx是偶函数
=cosxsin(x-1)-sinxcos(x-1) :和差化积公式：sinacosb-sinbcosa=sin(a-b)
=sin(x-1-x)
=sin(-1) :sinx是奇函数,sinx=-sin(-x);
=-sin1;
如果本题有什么不明白可以追问,

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