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x = a (t + \sin t), y = a (1 - \cos t)

\frac{d^{2} y}{d x^{2}}

এর মান কোনটি?

\frac{a}{(2 a - y)^{2}}

- \frac{a}{(a + 2 y)^{2}}

\frac{3 a}{a + 5 y}

\frac{2 a}{7 t}

\frac{a}{5 t}

ANS : 1

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