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If x= (e^(m) +e^(-m))/( 2) ,y =(e^(m) -...

If ` x= (e^(m) +e^(-m))/( 2) ,y =(e^(m) -e^(-m))/(2) ,then (dy)/(dx) =`

A

` (-y)/(x)`

B

` (y)/(x)`

C

` (-x)/(y)`

D

` (x)/(y)`

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The correct Answer is:
D
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