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Find the Exact Value of the Expression $\sec 240 ^ { \circ }$

Question 54

Multiple Choice

Find the exact value of the expression.
- $\sec 240 ^ { \circ }$

A) $- \frac { 2 \sqrt { 3 } } { 3 }$
B) 2
C) $- 2$
D) $\frac { 2 \sqrt { 3 } } { 3 }$

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