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


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