Engineering Board Exam Reviewer · Angles and Trigonometric Functions · easy
Find the exact value of 240°.
- 1/2
- - sqrt(3)2 -0.866
- sqrt(3)2 0.866
- - 1/2
Answer
D. - 1/2
Solution
The reference angle is 60° and cosine is negative in Quadrant III, so 240°=- 60°=- 12.
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