Tangent and Cotangent Trig Tables

**The Sine and Cosine**The triangle touching the unit circle at points (x,y) determines the sine and cosine functions.

- The triangle has:
- a vertical leg, THE SINE FUNCTION, with endpoints at (x,y) - a point on the circle - and (x,0) - a point on the x-axis,
- a horizontal leg, THE COSINE FUNCTION, with end points at (x,0) and the origin, (0,0), and
- a hypotenuse, length (or radius) of 1, with endpoints at the origin and the point (x,y) on the circle.

For detailed information on the sine and cosine functions, go to Function and Relation Library: Trigonometric Functions - sine or cosine.

**Zero Degrees, Zero Radians, Zero**

**First Quadrant**

**90 Degrees, /2 Radians,**

**Second Quadrant**

**180 Degrees, Radians,**

**Third Quadrant**

**270 Degrees, 3/2 Radians, 3/2**

**Fourth Quadrant**

© 2007, Agnes Azzolino

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