If satisfies the relation f(x+y)+f(x-y)=...

If satisfies the relation `f(x+y)+f(x-y)=2 " " f(x).f(y) AA x , y in R` and `f(0) != 0`, then `f(10)-f(-10)=`

A

0

B

1

C

2

D

3

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The correct Answer is:

A

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