cos-2= -0.4161 度=-23.8408和弧度=-0.4161
cos-1=0.5403 度=30.9569和弧度=0.5403
cos0=1 度=57.2958和弧度=1
cos1= 0.5403 度=30.9569和弧度=0.5403
cos2=-0.4161 度=-23.8408和弧度=-0.4161
cos-2= -0.4161 度=-23.8408和弧度=-0.4161
cos-1=0.5403 度=30.9569和弧度=0.5403
cos0=1 度=57.2958和弧度=1
cos1= 0.5403 度=30.9569和弧度=0.5403
cos2=-0.4161 度=-23.8408和弧度=-0.4161