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If f(x)=(1)/(2)[3^(x)+3^(-x)], g(x)=(1)/...

If `f(x)=(1)/(2)[3^(x)+3^(-x)], g(x)=(1)/(2)[3^(x)-3^(-x)]` then `f(x)g(y)+f(y)g(x)=`

A

f(x+y)

B

g(x+y)

C

2f(x)

D

2g(x)

Text Solution

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The correct Answer is:
B
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