Basic Trigonometric Functions

Definitions
Relationship Between Functions
1		2
3		4
Relationship Between Degress and Radians
5	1 rad = 150°/π = 57.295779513082320876798154814105°
6	1° = π/180 rad = 0.017453292519943295769236907684886 rad
Trigonometric Functions in Four Quadrants
			The angle θ described counterclockwise from positive X-axis is considered positive. This diagram shows the trigonometric functions with POSITIVE values in each quadrant.
Graph of Functions
Negative Angles
7	sin (-θ) = - sin θ	8	csc (-θ) = - csc θ
9	cos (-θ) = cos θ	10	sec (-θ) = sec θ
11	tan (-θ) = - tan θ	12	cot (-θ) = - cot θ
Angles More Than 90°
13	sin (90+θ) = sin θ	14	csc (90+θ) = csc θ
15	cos (90+θ) = - cos θ	16	sec (90+θ) = - sec θ
17	tan (90+θ) = - tan θ	18	cot (90+θ) = - cot θ
19	sin (180+θ) = - sin θ	20	csc (180+θ) = - csc θ
21	cos (180+θ) = - cos θ	22	sec (180+θ) = - sec θ
23	tan (180+θ) = tan θ	24	cot (180+θ) = cot θ
25	sin (270+θ) = - sin θ	26	csc (270+θ) = - csc θ
27	cos (270+θ) = cos θ	28	sec (270+θ) = sec θ
29	tan (270+θ) = - tan θ	30	cot (270+θ) = - cot θ