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If x= 2cost+cos 2t,y=2sin t-sin 2t ,the...

If ` x= 2cost+cos 2t,y=2sin t-sin 2t ,then " at " t= ( pi)/(4) ,(dy)/(dx) `

A

` 1+ sqrt2`

B

` -1-sqrt2 `

C

` sqrt2-1`

D

` 1-sqrt2`

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The correct Answer is:
D
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