sin^2x/(1+cotx)+cos^2x/(1+tanx)=1-sinxcosx
sin^2x/(1+cotx)+cos^2x/(1+tanx)=1-sinxcosx
数学人气:278 ℃时间:2019-12-26 15:35:30
优质解答
证明:左边=sin³x/(sinx+cosx)+cos³x/(sinx+cosx)=(sin³x+cos³x)/(sinx+cosx)=(sinx+cosx)(sinx²-sinxcosx+cos²x)/(sinx+cosx)=sin²x+cos²x-sinxcosx=1-sinxcosx=右边...
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