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x= cos y হলে

\frac{d y}{d x}

এর মান কত?

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

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

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

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

ANS : 2

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