f(x) = -(sen^4(x) - cos^4(x))
-(sen^4(x) - cos^4(x)) = - (sen^2(x) + cos^2(x))* (sen^2(x) - cos^2(x)) =
cos^2(x) - sen^2(x) = cos(2x)
pronto
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f(x) = -(sen^4(x) - cos^4(x))
-(sen^4(x) - cos^4(x)) = - (sen^2(x) + cos^2(x))* (sen^2(x) - cos^2(x)) =
cos^2(x) - sen^2(x) = cos(2x)
pronto