\( \cot ^{-1}(\sqrt{\cos 2 x}) \) का \( x=\frac{\pi}{6} \) पर अवकलन है- (A) \( \sqrt{\frac{2}{3}...
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\( \cot ^{-1}(\sqrt{\cos 2 x}) \) का \( x=\frac{\pi}{6} \) पर अवकलन है-
(A) \( \sqrt{\frac{2}{3}} \)
(B) \( \sqrt{\frac{1}{3}} \)
(C) \( \sqrt{3} \)
(D) \( \sqrt{6} \).
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