Use the fact that the trigonometric functions are periodic to find the exact value of the expression. Do not use a calculator.
-$$\cos \frac { 16 \pi } { 3 }$$
A) $- \frac { \sqrt { 3 } } { 2 }$
B) $\frac { \sqrt { 3 } } { 2 }$
C) $\frac { 1 } { 2 }$
D) $- \frac { 1 } { 2 }$

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The Answer of Use the fact that the trigonometric functions are periodic to find the exact value of the expression. Do not use a calculator.
-$$\cos \frac { 16 \pi } { 3 }$$
A) $- \frac { \sqrt { 3 } } { 2 }$
B) $\frac { \sqrt { 3 } } { 2 }$
C) $\frac { 1 } { 2 }$
D) $- \frac { 1 } { 2 }$

Use the Fact That the Trigonometric Functions Are Periodic to Find