`(dy)/(dx)` ज्ञात कीजिए|
`x=sint,y=cos2t`

Explanation

`x=sint " "y=cos 2t`
`rArr" "(dx)/(dt)=cost " "rArr" "(dy)/(dx)=-2sin 2t`
`therefore" "(dy)/(dx)=(dy//dt)/(dx//dt)=-(2sin2t)/(cost)`
`=-(2.2sin t cost)/(cost)=-4 sin t`