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If f(s) =(b^(s) +b^(-s))//2, where b gt ...

If `f(s) =(b^(s) +b^(-s))//2`, where `b gt 0`. Find `f(s+t) +f(s-t)`.

A

`f(s)-f(t)`

B

`2f(s).f(t)`

C

`4f(s).f(1)`

D

`f(s)+f(t)`

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The correct Answer is:
B
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