Nearest two positive coterminal angles and two negative coterminal angles. 5pi/2

Answer 1

5pi/2 = 2pi + pi/2

trig functions are the same for +pi/2, +5pi/2 or +9pi/2. pi/2 and 9pi/2 are closest to 5pi/2

or -3pi/2, or -7pi/2 for negative angles

that's 90 degrees and 5pi/2 = 450 degrees

-270 degrees and -630 degrees