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$\cos^{3} (\cos^{- 1} (\cot^{- 1} (\frac{\sqrt{3}}{z})))$ কত?

\frac{1}{8}

\frac{3 \sqrt{3}}{8}

\frac{\sqrt{3}}{8}

3 \sqrt{\frac{3}{8}}

ANS : 2

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