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Evaluate Without Using a Calculator by Using Ratios in a Reference

Question 484

Multiple Choice

Evaluate without using a calculator by using ratios in a reference triangle.
- $\sec 150 ^ { \circ }$

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

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