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Given the function `f(x)=(a^x+a^(-x))/2(w h e r ea >2)dotT h e nf(x+y)+f(x-y)=` `2f(x)dotf(y)` (b) `f(x)dotf(y)` `(f(x))/(f(y))` (d) none of these

A

`2f(x).f(y)`

B

`f(x).f(y)`

C

`f(x)/(f(y))`

D

none of these.

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The correct Answer is:
A
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