Cos(pi+a)+sin(3/2 pi -a)
cos(pi+a)=-cos(a)
-cos(a)-cos(a)
-1cos(a)-1cos(a)
(-1-1)*cos(a)
-2cos(a)
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Cos(pi+a)+sin(3/2 pi -a)
cos(pi+a)=-cos(a)
-cos(a)-cos(a)
-1cos(a)-1cos(a)
(-1-1)*cos(a)
-2cos(a)