Coterminal Angles/Reference Angles/The Unit Circle
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√3/2
cos330°=
How to find Coterminal Angles
Add or Subtract 360°
Coterminal Angle
Angles in standard position that have the same terminal side but a different degree of rotation.
-1/2
cos(1200°)=
0
cos270°=
-220°
is coterminal with 140°
1250°
is coterminal with 170°
600°
is coterminal with 240°
-5°
is coterminal with 355°
405°
is coterminal with 45°
135°
is coterminal with 495°
1/2
sin(-750°)
√2/2
sin135°=
-√2/2
sin585°
1
sin90°=
-1
tan(-45°)=
undefined
tan630°=
45°
the reference angle for -855°
30°
the reference angle for 570°
60°
the reference angle of 120°