cos(pi/2+x)=-sin(x)
sin(pi-x)=sin(x)
-2sinx=1
sinx=-1/2
x=-pi/6+2pi*n
x=7pi/6+2pi*n
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cos(pi/2+x)=-sin(x)
sin(pi-x)=sin(x)
-2sinx=1
sinx=-1/2
x=-pi/6+2pi*n
x=7pi/6+2pi*n