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Let f(n)=2cosn xAAn in N , then f(1)f(...

Let `f(n)=2cosn xAAn in N ,` then `f(1)f(n+1)-f(n)` is equal to (a)`f(n+3)` (b) `f(n+2)` (c)`f(n+1)f(2)` (d) `f(n+2)f(2)`

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