यदि f(x)=(2^(x)+2^(-x))/(2), तब f(x+y).f...

यदि `f(x)=(2^(x)+2^(-x))/(2)`, तब `f(x+y).f(x-y)=`

A

`(1)/(2)[f(2x)+f(2y)]`

B

`(1)/(2)[f(2x)-f(2y)]`

C

`(1)/(4)[f(2x)+f(2y)]`

D

`(1)/(4)[f(2x)-f(2y)]`.

लिखित उत्तर

Verified by Experts

The correct Answer is:

A

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