Let f(n) = 2 cos nx ∀ n ∈ N, then f(1) f(n + 1) – f(n) is equal to: (1) f(n + 3) (2) f(n + 2) (3) f(n + 1) f(2) (4) f(n + 2) f(2) Share with your friends Share 0 Decoder_6 answered this 1 View Full Answer