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Show that the equation of the normal at ...

Show that the equation of the normal at any point `'theta'` on the curvex = `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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CBSE COMPLEMENTARY MATERIAL-APPLICATION OF DERIVATIVES-4 MARK QUESTIONS
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