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Prove that the equation of the normal to...

Prove that the equation of the normal to `x^(2/3)+y^(2/3)=a^(2/3)` is `ycostheta-xsintheta=acos2theta,` where `theta` is the angle which the normal makes with the axis of `xdot`

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A DAS GUPTA-Application of dy/dx-Exercise
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