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If f(x) = (a^x + a^-x)/2, (a gt 2) then ...

If f(x) = `(a^x + a^-x)/2, (a gt 2)` then the value of `f(x + y)+f(x - y)` is equal to

A

a) `2f(x) cdot f(y)`

B

b) `f(x) cdot f(y)`

C

c) `(f(x))/(f(y))`

D

d) f (xy)

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The correct Answer is:
A
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