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

Given the function `f(x)=(a^(x)+a^(-x))/(2) ` ( where `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

`f(x)-f(y)`

Text Solution

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The correct Answer is:
A
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