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If x= e^(theta )(sin theta - cos th...

If ` x= e^(theta )(sin theta - cos theta ) , y= e^(theta ) ( sin theta + cos theta )` then `(dy)/(dx) ` at ` theta =(pi)/(4) `is

A

1

B

0

C

`1/sqrt2`

D

`sqrt2`

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A
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