Solution set of the inequality \( \left(\cot ^{-1} x\right)^{2}-\left(5 \cot ^{-1} x\right)+60 \...
Solution set of the inequality \( \left(\cot ^{-1} x\right)^{2}-\left(5 \cot ^{-1} x\right)+60 \) is
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(a) \( (\cot 3, \cot 2) \)
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(b) \( (-\infty, \cot 3) \cup(\cot 2, \infty) \)
(c) \( (\cot 2, \infty) \)
(d) None of the above
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