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কোন ফাংশনটির জন্য $(1 - x^{2}) \frac{d^{2} y}{d x^{2}} - x \frac{d y}{d x} = 2$ সত্য?

y = \cos^{- 1} (x)

y = {(\cos^{- 1} (x))}^{2}

y = y = \sin^{- 1} (x)

y = \tan^{- 1} (x)

ANS : 2

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