求证(1-2sinxcosx)/(cosx^2-sinx^2)=(cosx^2-sinx^2)/(1+2sinxcosx)
人气:394 ℃ 时间:2020-01-28 21:57:36
解答
(1-2sinxcosx)(1+2sinxcosx) =(sin²x+cos²x-2sinxcosx)(sin²x+cos²x+2sinxcosx)=(sinx-cosx)²(sinx+cosx)²=(sin²x-cos²x)²(cos²x-sin²x)(cos²x-sin&su...
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