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

Given the function \[f(x)=\frac{{{a}^{x}}+{{a}^{-x}}}{2},\ (a>2)\]. Th

1.	Given the function \[f(x)=\frac{{{a}^{x}}+{{a}^{-x}}}{2},\ (a>2)\]. Then \[f(x+y)+f(x-y)=\]
A.	\[2f(x).f(y)\]
B.	\[f(x).f(y)\]
C.	\[\frac{f(x)}{f(y)}\]
D.	None of these
Answer» B. \[f(x).f(y)\]

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

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