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If f(x)=coshx+sinhx and f(x)f(y)=f(k) th...

If `f(x)=coshx+sinhx and f(x)f(y)=f(k)` then k =

A

xy

B

`(x)/(y)`

C

`x-y`

D

`x+y`

Text Solution

Verified by Experts

The correct Answer is:
D
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