Question

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

Answer 1

Answer B

Explanation:

cos n + x =cos x + y