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Find (dy)/(dx): x=a sin 2t (1+ cos 2t)...

Find `(dy)/(dx)`:
`x=a sin 2t (1+ cos 2t) and y= b cos 2t`
`(1-cos 2t)` show that, `((dy)/(dx))_(t = (pi)/(4))= (b)/(a)`

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