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If x=2cos theta -cos 2theta ,y=2sin the...

If ` x=2cos theta -cos 2theta ,y=2sin theta -sin 2theta ,then (dy)/(dx) =`

A

`(1)/(sqrt(2)-1)`

B

1

C

`(1)/(sqrt(2)`

D

`sqrt(2)+1`

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The correct Answer is:
A
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