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যদি

\sec θ = x

\frac{d θ}{d x} = ?

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

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

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

\frac{1}{\sqrt{x (x^{2} - 1)}}

ANS : 3

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