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যদি

x = a (θ - \sin θ)

y = a (1 + \cos θ)

\frac{d y}{d x}

এর মান হবে-

- c o t \frac{θ}{2}

- \sin θ

1 - \cos θ

- \tan \frac{θ}{2}

ANS : 1

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