Question

Solve 2cos^2x + cosx − 1 = 0 for x over the interval [0, 2 π ).

a.π and π/3
b.π, π/3, and 5π/3
c.1 and 2π/3
d.1, 2π/3, and 4π/3
e.1, π/3, and 5π/3

Answer 1

Option B

Explanation:

`\pi ,(\pi )/(3), and (5\pi )/(3)`

Answer 2

the answer is (b) all this value of x satisfy the equation