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Let f(n)=2 cos nx AA n in N, then f(1)f(...

Let `f(n)=2 cos nx AA n 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 +1) f (2)`

Text Solution

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The correct Answer is:
B
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