differentiation

Question: If $x = a{\cos ^3}\theta ,y = a{\sin ^3}\theta $, then $\sqrt {1 + {{\left( {\frac{{dy}}{{dx}}} \right)}^2}} = $



1) ${\tan ^2}\theta $
2) ${\sec ^2}\theta $
3) $\sec \theta $
4) $|\sec \theta |$
Solution: Explanation: Explanation
Implicit-function

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