cos(x)=sqrt((1+sin(x))/2)

-pi
x1 = —-
2

pi
x2 = —
6

x1 = 67.5442420522000

x2 = 69.6386371546000

x3 = -30.8923277603000

x4 = -12.0427718388000

x5 = 86.3937979737000

x6 = -49.7418836818000

x7 = -62.3082542962000

x8 = 48.6946861306000

x9 = 6.80678408278000

x10 = 61.2610567450000

x11 = -37.1755130675000

x12 = -89.5353906273000

x13 = 88.4881930761000

x14 = -95.8185759345000

x15 = -93.7241808321000

x16 = 17.2787595947000

x17 = -32.9867228627000

x18 = -187.971960440000

x19 = 38.2227106187000

x20 = -100.007366139000

x21 = -81.1578102177000

x22 = -58.1194640914000

x23 = 44.5058959259000

x24 = -43.4586983747000

x25 = 94.7713783833000

x26 = 36.1283155163000

x27 = 73.8274273594000

x28 = -14.1371669412000

x29 = 80.1106126665000

x30 = -106.290551446000

x31 = -87.4409955249000

x32 = 10.9955742876000

x33 = -74.8746249106000

x34 = 4.71238898038000

x35 = 23.5619449019000

x36 = -39.2699081699000

x37 = -83.2522053201000

x38 = 50.7890812330000

x39 = -68.5914396034000

x40 = -24.6091424531000

x41 = -5.75958653158000

x42 = -26.7035375555000

x43 = 31.9395253115000

x44 = -56.0250689890000

x45 = -18.3259571459000

x46 = 92.6769832809000

x47 = 75.9218224618000

x48 = 98.9601685881000

x49 = -45.5530934771000

x50 = 25.6563400043000

x51 = -51.8362787842000

x52 = -64.4026493986000

x53 = 54.9778714378000

x54 = 57.0722665402000

x55 = 63.3554518474000

x56 = -20.4203522483000

x57 = 0.523598775598000

x58 = -7.85398163397000

x59 = 19.3731546971000

x60 = -76.9690200129000

x61 = -1.57079632679000

x62 = 13.0899693900000

x63 = 29.8451302091000

x64 = 42.4115008235000

x65 = 82.2050077689000

x66 = -70.6858347058000