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যদি

y = \tan^{- 1} \frac{p + q x}{q - p x}

\frac{d y}{d x}

এর মান কত?

1 + 7 x

2 + 5 x

\frac{1}{1 + x^{2}}

\frac{2}{1 + x^{2}}

\frac{7}{1 + x^{2}}

ANS : 3

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