If \( l=\int \sec ^{2} x \operatorname{cosec}^{4} x d x \) \( \math...
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If \( l=\int \sec ^{2} x \operatorname{cosec}^{4} x d x \)
\( \mathrm{P}^{15} \)
W \( =A \cot ^{3} x+B \tan \mathrm{x}+C \cot \mathrm{x}+D \), then
(1) \( A=-\frac{1}{3} \)
(2) \( B=2 \)
(3) \( C=-2 \)
(4) None of these
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