Evaluate: x [3] x d x - Vidyadip

MCQ

Evaluate: $\int \frac{\cot x}{\sqrt[3]{\sin x}} d x$

A
$\frac{-3}{\sqrt[3]{\sin x}}+C$
B
$\frac{-2}{\sin ^3 x}+C$
C
$\frac{3}{\sin ^{1 / 3} x}+C$
D
None of these

✓

Answer

$
\begin{array}{l}
\text { (a) : Let } I=\int \frac{\cot x}{\sqrt[3]{\sin x}} d x=\int \frac{\cos x}{\sin ^{1 / 3} x \cdot \sin x} d x \\
=\int \frac{\cos x}{\sin ^{4 / 3} x} d x=\int \sin ^{-4 / 3} x \cdot \cos x d x
\end{array}
$
Put $\sin x=t \Rightarrow \cos x d x=d t$
$
\Rightarrow I=\int t^{-4 / 3} d t=\frac{t^{-1 / 3}}{-1 / 3}+C=\frac{-3}{\sqrt[3]{\sin x}}+C
$

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