Use Reduction Formulas to Evaluate the Integral $$\int \cot ^ { 4 } 3 x d x$$

Multiple Choice

Use reduction formulas to evaluate the integral.
- $$\int \cot ^ { 4 } 3 x d x$$

A) $- \frac { 1 } { 3 } \cot ^ { 3 } 3 x - \frac { 1 } { 3 } \cot 3 x + x + C$
B) $- \frac { 1 } { 9 } \cot ^ { 3 } 3 x + \frac { 1 } { 3 } \cot 3 x + x + C$
C) $- \frac { 1 } { 9 } \cot ^ { 2 } 3 x + \frac { 1 } { 3 } \cot 3 x - x + C$
D) $- \frac { 1 } { 9 } \cot ^ { 3 } 3 x + \frac { 1 } { 3 } \cot 3 x + C$