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Show that the equation of normal at any ...

Show that the equation of normal at any point on the curve `x = 3 cos theta - cos^(3) theta, y = 3 sin theta - sin^(3) theta "is" 4 (y cos^(3) theta - x sin^(3) theta) = 3 sin 4 theta`.

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The correct Answer is:
`rArr" "4(y cos^(3) theta - x sin^(3) theta) = 3 sin 4 theta`
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