The Unit Circle

Cos(2π) or Cos(0)

1

Sin (2π) or Sin(0)

0

Cos(π) or Cos(-π)

-1

Sin(π) or Sin(-π)

0

Cos(π/6) or Cos(-11π/6)

√(3)/2

Sin(π/6) or Sin(-11π/6)

1/2

Cos(π/4) or Cos(-7π/4)

√(2)/2

Sin(π/4) or Sin(-7π/4)

√(2)/2

Cos(π/3) or Cos(-5π/3)

1/2

Sin(π/3) or Sin(-5π/3)

√(3)/2

Cos(π/2) or Cos(-3π/2)

0

Sin(π/2) or Sin(-3π/2)

1

Cos(2π/3) or Cos(-4π/3)

-1/2

Sin(2π/3) or Sin(-4π/3)

√(3)/2

Cos(3π/4) or Cos(-5π/4)

-√(2)/2

Sin(3π/4) or Sin(-5π/4)

√(2)/2

Cos(5π/6) or Cos(-7π/6)

-√(3)/2

Sin(5π/6) or Sin(-7π/6)

1/2

Cos(-5π/6) or Cos(7π/6)

-√(3)/2

Sin(-5π/6) or Sin(7π/6)

-1/2

Cos(-3π/4) or Cos(5π/4)

-√(2)/2

Sin(-3π/4) or Sin(5π/4)

-√(2)/2

Cos(-2π/3) or Cos(4π/3)

-1/2

Sin(-2π/3) or Sin(4π/3)

-√(3)/2

Cos(-π/2) or Cos(3π/2)

0

Sin(-π/2) or Sin(3π/2)

-1

Cos(-π/3) or Cos(5π/3)

1/2

Sin(-π/3) or Sin(5π/3)

-√(3)/2

Cos(-π/4) or Cos(7π/4)

√(2)/2

Sin(-π/4) or Sin(7π/4)

-√(2)/2

Cos(-π/6) or Cos(11π/6)

√(3)/2

Sin(-π/6) or Sin(11π/6)

-1/2