- Trig for larger angles: What's sin(250)? Use the unit circle to tackle bigger angles
- Trig for negative angles: Using the unit circle for trig with negative angles
- Trig for coterminals: How trig functions are related for coterminal angles.
The unit circle has coordinates (x, y) which x-axis as cos(θ) and y-axis as sin(θ), where θ is the angle that the line segment from the origin to (x, y) makes with the positive x-axis and the point (x, y) goes around the circle, its y-coordinate is sin θ.
The counter-clockwise rotation angle is positive, and the angle is negative when the rotation is clockwise.
Coterminal angles differ by an integer multiple of 360 degrees then each trigonometric function will have equal values at both angles, which have the same initial and terminal sides.
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