Determine two coterminal angles (one positive and one negative) for each angle. Give your answers in radians.

Question

Determine two coterminal angles (one positive and one negative) for each angle. Give your answers in radians. (Enter your answers as comma-separated lists.)

a) 2𝜋/3 b) − 9𝜋/4

Answer 1

2pi/3 = 150 degrees

coterminal angles are 2p/3 +/- 2pi

= 150+/-360 = 510 degrees or -210,

or 2pi/3 +/- 2pi = 8pi/3 or -4pi/3