unit circle

cos 0 = 1

sin 0 = 0

cos 30 = √3/2

sin 30 = 1/2

cos 45 = √2/2

sin 45 = √2/2

cos 60 = ½

sin 60 = √3/2

cos 90 = 0

sin 90 = 1

cos 120 = -1/2

sin 120 = √3/2

cos 135 = -√2/2

sin 135 = √2/2

cos 150 = -√3/2

sin 150 = 1/2

cos 180 = -1

sin 180 = 0

cos 210 = -√3/2

sin 210 = -1/2

cos 225 = -√2/2

sin 225 = -√2/2

cos 240 = -1/2

sin 240 = -√3/2

cos 270 = 0

sin 270 = -1

cos 300 = ½ sin 300 = -√3/2

cos 315 = √2/2

sin 315 = -√2/2

cos 330 = √3/2

sin 330 = -1/2.