This Program displays an exact radical expression for sinX, cosX, or tanX, for X given in degrees or radians and X degrees is a multiple of 7.5 or 18. This includes 7.5, 15, 18, 22.5, 30, 36, 37.5, 45, 52.5, 54, 60, 67.5, 72, 75, 82.5, 90, 97.5, 105, 108, etc. and the corresponding radian measures pi/24, pi/12, pi/10, pi/8, pi/6, pi/5, 5pi/24, pi/4, 7pi/24, etc.. For example cos(15 degrees) displays as (sqrt(6) + sqrt(2))/4.
