\[ \int \operatorname{cosec}^{3}(2 x+1) \cot (2 x+1) d x=? \] (a) \...

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\[
\int \operatorname{cosec}^{3}(2 x+1) \cot (2 x+1) d x=?
\]
(a) \( \frac{1}{4} \operatorname{cosec}^{4}(2 x+1)+C \)
(b) \( -\frac{1}{3} \operatorname{cosec}^{3}(2 x+1)+C \)
\( \mathrm{P} \)
(c) \( -\frac{1}{6} \operatorname{cosec}^{3}(2 x+1)+C \)
(d) \( \frac{1}{2} \operatorname{cosec}(2 x+1) \cot (2 x+1)+C \)
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