cos(π/4+X)=3/5,17π/12
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cos(π/4+X)=3/5,17π/12cos(π/4+X)=3/5,17π/12cos(π/4+X)=3/5,17π/12COSX-SinX=3/5*2^0.5;cosX*sinX=7/50;Co
cos(π/4+X)=3/5,17π/12 cos(π/4+X)=3/5,17π/12
cos(π/4+X)=3/5,17π/12
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
cos(π/4+x)=3/5,17π/12
cos(π/4+X)=3/5,17π/12
cos(π/4+x)=3/5,17π/12
cos(π/4+x)=3/5,17π/12
cos(π/4+x)=3/5,17/12π
cos(π/4+x)=3/5,17π/12
cos(π/4+x)=3/5,17π/12
cos(π/4+x)=3/5,-17π/12
cos(2x-π)/[根号2cos(x+π/4)]=-1/5,0
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