Respuesta :

sin^2 θ * cos^2 θ - cos^2 θ
cos^2 θ (sin^2 θ - 1)

lol  sin^2 θ + cos^2 θ = 1 so replace 1


cos^2 θ (sin^2 θ - (sin^2 θ + cos^2θ) )

cos^2 θ (sin^2 θ - sin^2 θ - cos^2θ )

cos^2 θ (-cos^2θ )

-cos^4 θ

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