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\sqrt[4]{- 81}

এর মান কত?

\frac{9}{2} (\pm 2 i)

\pm \frac{2}{\sqrt{2}} \sqrt{\pm 2} i

\pm \frac{3}{\sqrt{2}} (1 \pm i)

\pm \frac{3}{2} (1 \pm i)

ANS : 3

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