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যদি $y = \tan^{- 1} \frac{p + q x}{q - p x}$ হয়, তবে $\frac{d y}{d x}$ এর মান কত ?

1+7x

p+qx

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

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

ANS : 0

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