Given the function \( f(x)=\frac{a^{x}+a^{-x}}{2} \) (where \( a2 \) ). Then \( f(x+y)+f(x-y)= \...
Given the function \( f(x)=\frac{a^{x}+a^{-x}}{2} \) (where \( a2 \) ). Then \( f(x+y)+f(x-y)= \)
(A) \( 2 f(x) \cdot f(y) \)
(B) \( f(x) \cdot f(y) \)
(C) \( \frac{f(x)}{f(y)} \)
(D) none of these
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