In radians, find all angles that have a tangent of 2.5 in the interval [0,2pi)

Answer 1

Tangent is positive in quadrants 1 and 3 so set your calculator to radio mode and hit inverse tangent of 2.5 and you get an answer of 1.20 radians which will be in quadrant 1

The angle in quadrant 3 will be pi or 3.14 radians plus 1.2 radians = 4.34 radians