fun-lim

Question: Given the function $f(x)=\frac{{{a}^{x}}+{{a}^{-x}}}{2},\ (a>2)$. Then $f(x+y)+f(x-y)=$



1) $2f(x).f(y)$
2) $f(x).f(y)$
3) $\frac{f(x)}{f(y)}$
4) None of these
Solution: Explanation: No Explanation
Functions

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