Mark against the correct answer in each of the following:

Question:

Mark $(\sqrt{)}$ against the correct answer in each of the following:

$\int \cot ^{2} x d x=?$

A. $-\cot x-x+C$

B. $\cot \mathrm{x}-\mathrm{x}+\mathrm{C}$

C. $-\cot x+x+C$

D. $\cot x+x+C$

Solution:

Given:

$\int \cot ^{2} x d x=\int\left((\csc x)^{2}-1\right) d x$

$=-\cot x-x+c$

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