with javascript_semantics
?sin(PI/2)
?sin(90*PI/180)
?cos(0)
?cos(0*PI/180)
?tan(PI/4)
?tan(45*PI/180)
?arcsin(1)*2
?arcsin(1)*180/PI
?arccos(0)*2
?arccos(0)*180/PI
?arctan(1)*4
?arctan(1)*180/PI