cos(π/4+X)=3/5,17π/12扫码下载作业帮拍照答疑一拍即得

问题描述:

cos(π/4+X)=3/5,17π/12

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拍照答疑一拍即得

COSX-SinX=3/5*2^0.5;cosX*sinX=7/50;CosX+sinX=-4/5*2^0.5,[sin2X+2(sinX)^2]/(1-tanX)=2[sinxcosx(cosx+sinx)]/cosx-sinx=-28/75