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If the normal to the curve x^((2)/(3))+y...

If the normal to the curve `x^((2)/(3))+y^((2)/(3))=a^((2)/(3))` at any point makes an angle `phi` with posititive direction of the x-axix, prove that, the equastion of the normal is
`y cos phi- x sin phi= a cos 2 phi`

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