differentiation

Question: The length of the normal at point ‘t’ of the curve $x=a(t+\sin t),$ $y=a(1-\cos t)$ is



1) $a\sin t$
2) $2a{{\sin }^{3}}(t/2)\sec (t/2)$
3) $2a\sin (t/2)\,\,\tan \,(t/2)$
4) $2a\sin (t/2)$
Solution: Explanation: No Explanation
Tangent and Normal

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