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x=a(2t+sin2t),y=a(1-cos2t)...

x=a(2t+sin2t),y=a(1-cos2t)

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

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