Half angle A=(kπ, kπ +π/4) The first quadrant or the third quadrant.
2 Angle A=(4kπ, 4kπ +π) First or second quadrant
2. Angle A is the second quadrant angle: Angle A=(2kπ +π/2, 2kπ +π )(k is a positive integer).
Half angle A=(kπ +π/4, kπ +π/2) The first quadrant or the third quadrant.
2 Angle A=(4kπ +π, 4kπ +2π) The third or fourth quadrant.
3. Angle A is the third quadrant angle: Angle A=(2kπ +π, 2kπ +π3/2 )(k is a positive integer).
Half angle A=(kπ +π/2, kπ +π3/4) The second quadrant or the fourth quadrant.
2 Angle A = (4π+2π, 4kπ +3π) First or second quadrant
4. Angle A is the fourth quadrant angle: Angle A=(2kπ +π3/2, 2kπ +2π)(k is a positive integer).
Half angle A=(kπ +π3/4, kπ +π) The second quadrant or the fourth quadrant.
2 Angle A = (4π+3π, 4kπ +4π) The third or fourth quadrant