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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

4

B

`2 sqrt2`

C

2

D

`sqrt2`

Text Solution

Verified by Experts

The correct Answer is:
C
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