abbygarcia12 abbygarcia12 21-05-2020 Mathematics contestada Prove cos (x - n) = -cOS X. cos (x - 7) = cos x sin n - sin x cos n = -cos X cos (x - n) = cos x cos n - sin x sin n = -cos X cos (x - n = cos x sinn + sin x cos n = -cos X cos (x - n) = cos x cos n + sin x sin n = -cos x
