Values of cosine on the unit circle
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cos 210 or cos 7π/6
-√3/2
cos(150) or cos(5pi/6)
-√3/2
cos(120) or cos(2pi/3)
-1/2
cos(240) or cos(4pi/3)
-1/2
cos(225) or cos(5pi/4)
-√2/2
Cos270 or cos 3pi/2
0
cos(0)
1
cos(360) or cos(2π)
1
cos(60) or cos(pi/3)
1/2
cos(45) or cos(pi/4)
√2/2
cos 180 or cos π
-1
cos(135) or cos(3pi/4)
-√2/2
cos(90) or cos(π/2)
0
cos(300) or cos(5pi/3)
1/2
cos(315) or cos(7pi/4)
√2/2
cos(30) or cos(pi/6)
√3/2
cos(330) or cos(11pi/6)
√3/2
