The Antiderivative $\int \left( 1 + \cot ^ { 2 } x \right) d x$

Multiple Choice

The antiderivative $\int \left( 1 + \cot ^ { 2 } x \right) d x$ is

A) $x + \frac { \cot ^ { 3 } x } { 3 } + C$
B) $x - \frac { \cot ^ { 3 } x } { 3 } + C$
C) $- \csc ^ { 2 } x + C$
D) $- \cot ^ { 2 } x + C$
E) $- \cot x + C$