作业帮-sinx=cos((3π/2-x)从-sinx推导
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-sinx=cos((3π/2-x)从-sinx推导
-sinx=cos((3π/2-x)
从-sinx推导
-sinx=cos((3π/2-x)从-sinx推导
cos(3π/2－x)=cos(3π/2)cosx＋sin(3π/2)sinx=－sinx
则：
－sinx=cos(3π/2－x)
-sinx = cos(π/2)cosx-sin(π/2)sinx
= cos(π/2+x)
= cos[2π-(3π/2-x)]
= cos(3π/2-x)