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যদি k>1 হয়,তবে

\frac{2}{\sqrt{k + 1} + \sqrt{k - 1}} = ?

\frac{\sqrt{k + 1}}{\sqrt{k - 1}}

2 \sqrt{k + 1} + \sqrt{k - 1}

\sqrt{k + 1} - \sqrt{k - 1}

ANS : 4

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