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Evaluate Without Using a Calculator by Using Ratios in a Reference

Question 487

Multiple Choice

Evaluate without using a calculator by using ratios in a reference triangle.
- $\cos \left( - \frac { 5 \pi } { 4 } \right)$

A) $\frac { 1 } { 2 }$
B) $- \frac { \sqrt { 3 } } { 2 }$
C) $\frac { \sqrt { 3 } } { 2 }$
D) $- \frac { \sqrt { 2 } } { 2 }$

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