Question 2
TrigonometrySolve: 2cos x − 1 = 0, for 0 ≤ x ≤ 2π
- A.(2π/3, 4π/3)
- B.(π/6, 5π/6)
- C.(π/5, 2π/5)
- D.(π/3, 5π/3)
Show the answer and explanation
Answer: D ((π/3, 5π/3))
Explanation
cos x = ½, which happens at x = π/3 and x = 2π − π/3 = 5π/3.
Solve: 2cos x − 1 = 0, for 0 ≤ x ≤ 2π
Answer: D ((π/3, 5π/3))
cos x = ½, which happens at x = π/3 and x = 2π − π/3 = 5π/3.