Verify the identity. cos 4 t- sin 4 t=1 -2 sin 2 t Which of the following four statements establishes the identity? A. cost - sin 4 t= (cos 2 t - sin ? t) (cos 2 t - sin 2 t) = 1 -2 sin 2 t B. cost - sin 4 t= (cos 2 1 + sin ? t) (cos 2 1 - sin ? t) = 1 -2 sin 2 t C. cost - sin 4 t= (sin 2 1) (cos 2 1 + sin 2 1) = 1 -2 sin 2 t ) D. cos 4 t - sin 4 t= (cos 2 1) (cos ? t + sin ? t) =1 -2 sint