Question

$\bf मान \: लीजिए \: कि \: \cot ^{ - 1} \: \: ( \frac{ - 1}{ \sqrt{3} } ) = y \: अतएव$
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Answer 1

the answer is $\bf \frac{2\pi}{3}$

Answer 2

$\sf \therefore hence \: the \: answer \: is \: \bf \frac{2\pi}{3}$