Engineering Board Exam Reviewer · Trigonometric Equations · medium

How many solutions does 2 = 12 have in the interval 0°≤ <360°?

1. 2
2. 6
3. 8
4. 4

Answer

D. 4

Solution

2 =30°,150°,390°,510° in [0°,720°), so =15°,75°,195°,255°: four solutions.

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