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Given the function f (x) =(a ^(x) + a ^(...

Given the function `f (x) =(a ^(x) + a ^(-x))/(2), a gt 2,` then `f (x+y) + f(x -y) =`

A

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

B

`f (x). F(y)`

C

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

D

`1/2 f (x) f (y)`

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The correct Answer is:
A
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