Use the Fact That the Trigonometric Functions Are Periodic to Find

Use the fact that the trigonometric functions are periodic to find the exact value of the expression. Do not use a calculator.
- $\cot 390 ^ { \circ }$

A) $\frac { \sqrt { 3 } } { 3 }$
B) $\sqrt { 3 }$
C) $- \frac { \sqrt { 3 } } { 3 }$
D) $- \sqrt { 3 }$

Correct Answer:

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