Engineering Board Exam Reviewer · Trigonometric Equations · easy

Find the smallest positive angle for which =- 12.

1. 60°
2. 120°
3. 150°
4. 240°

Answer

B. 120°

Solution

Cosine is negative in Quadrants II and III; the reference angle is 60°. The smallest positive solution is 180°-60°=120°.

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