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

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

Answer 2

Answer:

Option  B

Step-by-step explanation:

$\pi ,\frac{\pi }{3}, and \frac{5\pi }{3}$