Engineering Board Exam Reviewer · Trigonometric Equations · medium
Find the sum of all solutions of 2 2 - -1=0 in the interval 0°≤ <360°.
- 420°
- 540°
- 630°
- 720°
Answer
C. 630°
Solution
Factor: (2 +1)( -1)=0. =1 =90°; =- 12 =210°,330°. Sum =90+210+330=630°.
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