Can you help me understand this please

Evaluate the expression without using a calculator. Answer #14-21 in degrees and #22-27 in radians. 14) arcsin 1 9 0 15) arcsin ( - 16) arcsin ( 3, 17) cos -1 ( V2) 45 18) arccos (-- 2 19 ) tan -' (-V3) 120 |20) arctan (-1) 21) arctan (- V3 , 22) sin (-1) 23) arccos (-) 24) arcsin 1 25) arcsin (- N 26) arcsin 27) cos -1 ( V2, State the degrees, radians, and coordinates of the Unit Circle