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If e^(x+y) =cos (x-y) ,then (dy)/(dx)=...

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

A

` -((e^(x+y)+sin (x-y))/( e^(x+y) -sin (x-y)))`

B

` -((e^(x+y) -sin (c-y))/( e^(x+y) +sin (x-y)))`

C

` (e^(x+y) +sin (x-y))/( e^(x+y) -sin (x-y))`

D

` (e^(x+y) -sin (x-y)) /( e^(x+y) +sin (x-y))`

Text Solution

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The correct Answer is:
A
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