?=(360/?*(?(2-2*?((COS2?+1)/2))))/2
?=15
?=7.5
?=3.75
?=1.875
?=0.9375
?=0.46875
?=0.234375
?=0.1171875
?=0.05859375
?=0.029296875
?=0.014648438
?=0.007324219
?=0.003662109
?=0.001831055
?=15
?=7.5
?=3.75
?=1.875
?=0.9375
?=0.46875
?=0.234375
?=0.1171875
?=0.05859375
?=0.029296875
?=0.014648438
?=0.007324219
?=0.003662109
?=0.001831055