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Let a function is defined as f(x)=(a^(x)...

Let a function is defined as `f(x)=(a^(x)+a^(-x))/(2), a gt 0`, what is the value of `f(x+y)+f(x-y)`?

A

f(x)+f(y)

B

f(x)f(y)

C

2f(x)f(y)

D

f(x)f(y)

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The correct Answer is:
C
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