2.
% = Hundertstel also z.b. 12.34% = 12.34/100 = 0.1234
arctan(0.05) = tan^{-1}(0.05) = 2.86°
arctan(0.25) = tan^{-1}(0.25) = 14.04°
arctan(0.50) = tan^{-1}(0.50) = 26.57°
arctan(0.90) = tan^{-1}(0.90) = 41.99°
arctan(1.00) = tan^{-1}(1.00) = 45.00°
arctan(2.00) = tan^{-1}(2.00) = 63.43°
arctan(5.00) = tan^{-1}(5.00) = 78.69°
3.
tan(25.2°) = 0.4706 = 47.06%
tan(52.7°) = 1.3127 = 131.27%
tan(89.2°) = 71.6151 = 7161.51%