differentiation

Question: The length of normal to the curve $x=a\,(\theta +\sin \theta ),$ $y=a(1-\cos \theta )$ at the point $\theta =\pi /2$ is



1) $2a$
2) $a/2$
3) $\sqrt{2}\,a$
4) $a/\sqrt{2}$
Solution: Explanation: No Explanation
Tangent and Normal

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