1.

Given the function f(x)=(a^(x)+a^(-x))/(2)( where a gt 2 ). Then f(x+y)+f(x-y)=

Answer»

`2F(X).F(y)`
`f(x).f(y)`
`(f(x))/(f(y))`
`f(x)-f(y)`

ANSWER :A


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