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

If x = `e^theta` (sin `theta` - cos `theta`), y = `e^theta` (cos `theta` + sin `theta`), then `frac{dy}{dx}` at `theta` = `frac {pi}{4}` is ..........
(a) `-1`
(b) `1`
(c) `1/2`
(d) `-1/2`

A

1

B

0

C

`1/sqrt2`

D

`sqrt2`

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The correct Answer is:

A

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