Engineering Board Exam Reviewer · Trigonometric Equations · medium
Find the angle x between 0° and 90° that satisfies x= 2x.
- 60°
- 45°
- 15°
- 30°
Answer
D. 30°
Solution
x=1-2 2x 2 2x+ x-1=0 (2 x-1)( x+1)=0. In the first quadrant, x= 12, so x=30°.
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