Solving Trigonometric Equations Using Identities

6. Trigonometric Identities and More Equations / Solving Trigonometric Equations Using Identities / Problem 1

Solve the following trigonometric equation on the interval [0, 2π) with the help of an identity.
2sin² x + cos x - 1 = 0

2π/3, 4π/3

0, 2π/3

0, 4π/3

0, 2π/3, 4π/3

Solve the following trigonometric equation on the interval [0, 2π) with the help of an identity.2sin2 x + cos x - 1 = 0