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Let f(x+y)+f(x-y)=2f(x)f(y) AA x,y in R ...

Let `f(x+y)+f(x-y)=2f(x)f(y) AA x,y in R` and `f(0)=k`, then

A

`f(2)+f(-2)=0`

B

`f(3)+f(-3)=0`

C

`f^'(2)+f^'(-2)=0`

D

`f^'(3)+f^1(-3)`

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