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\tan y = \frac{2 t}{1 - t^{2}}, \sin x = \frac{2 t}{1 + t^{2}}

\frac{d y}{d x}

কত ?

2 \tan^{- 1} t

2 \sin^{- 1} t

\sin^{- 1} \frac{2 t}{1 + t^{2}}

1

ANS : 4

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