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luego, la integral de (1-cos^2(x))/2 es:
int(1/2)dx - int((cos(2x))/2)dx
= x/2 - (sen(2x))/4 + C ; C en R
analogamente se resuelve para sen^2(2x)
aqui, sen^2(2x) = (1-cos(4x))/2
int(1/2)dx - int((cos(4x)/2)dx
=x/2 - (sen(4x))/8+ C ; C en R