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

If `f(x)=(2^(x)+2^(-x))/(2)`, then `f(x+y).f(x-y)` is equal to

A

f(x+y+z)

B

f(x+y+z+1)

C

f(x+y+z+2)

D

f(x+y+z+3)

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The correct Answer is:
C
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  17. The domain of the function f(x)=(|x+3|)/(x+3) is

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