Find the Exact Value of the Indicated Trigonometric Function of θ

Multiple Choice

Find the exact value of the indicated trigonometric function of θ.
- $\cos \theta = \frac { 21 } { 29 } , \frac { 3 \pi } { 2 } < \theta < 2 \pi \quad$ Find $\cot \theta$

A) $- \frac { 20 } { 21 }$
B) $- \frac { 21 \sqrt { 2 } } { 4 }$
C) $- \frac { 21 } { 20 }$
D) $\frac { 29 } { 20 }$