14
RCMultiple Choice
Solving Trigonometric Equations — Cumulative exam
Question 14 • Precalculus
For 0 ≤ x < 2π, which of the following solves 2cos + 1 = 0?
Answer
A
Left-brace StartFraction 4 pi Over 3 EndFraction right-brace
B
Left-brace StartFraction 5 pi Over 3 EndFraction right-brace
C
Left-brace StartFraction pi Over 3 EndFraction, StartFraction 2 pi Over 3 EndFraction right-brace
D
Left-brace StartFraction pi Over 3 EndFraction, StartFraction 5 pi Over 3 EndFraction right-brace