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Given the function f(x)=(a^x+a^(-x))/2(w...

Given the function `f(x)=(a^x+a^(-x))/2(w h e r ea >2)dotT h e nf(x+y)+f(x-y)=` (A) `2f(x).f(y)` (B) `f(x).f(y)` (C) `f(x)/f(y)` (D) none of these

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