Question

Find an angle between 0 and 2π that is coterminal with −9π/2? .

Answer 1

(3pi)/2

Explanation:

The arc (angle) `(-9pi)/2` has the same terminal as the arc
`(-pi/2 - (8pi)/2) = - pi/2`
The arc `(-pi/2)` is co-terminal to the arc `(3pi)/2`