Unit circle
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3pi/2
270 degrees cos 0 sin -1
pi/6
30 degrees cos sqrt 3/2 sin 1/2
5pi/3
300 degrees cos 1/2 sin -sqrt3/2
7pi/4
315 degrees cos sqrt 2/2 sin sqrt -2/2
11pi/6
330 degrees cos sqrt 3/2 sin -1/2
pi/4
45 degrees sqrt 2/2 for sin and cos
pi/3
60 degrees cos 1/2 , sin square root 3/2
pi/2
90 degrees (0,1)
