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If x=a\ cos^3theta,\ \ y=a\ sin^3theta ,...

If `x=a\ cos^3theta,\ \ y=a\ sin^3theta` , then `(1+((dy)/(dx))^2)=` (a)`t a n^2theta` (b) `s e c^2theta` (c) `sectheta` (d) `|sectheta|`

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Given `x = a cos^3 theta`
`(dx)/(d theta) = -3a cos^2 theta sin theta`
`y = a sin^3 theta`
`(dy)/(d theta) = 3a sin^2 theta cos theta` ...
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