## Trig Cheat Sheet

**Trig Cheat Sheet**: Trigonometry is the study of triangles, which contain angles, of course. Get to know some special rules for angles and various other important functions, definitions, and translations. Sines and cosines are two trig functions that factor heavily into any study of trigonometry; they have their own formulas and rules that you’ll want to understand if you plan to study trig for very long.

**Definition of the trig functions**

### Right Triangle Definition

### Unit Circle Definition

### Domain

### Range | Trig Cheat Sheet

### Period | Trig Cheat Sheet

### Tangent and Cotangent Identities | Trig Identities Cheat Sheet

### Reciprocal Identities | Trig Identities Cheat Sheet

### Pythagorean Identities

### Even/Odd Formulas

### Periodic Formulas

### Double Angle Formulas

### Degree to Radians Formulas

As you study trig, you’ll find occasions when you need to change radians to degrees, or vice versa. A formula for changing from degrees to radians or radians to degrees is:

### Half Angle Formulas

### Sum and Difference Formulas

### Product to Sum Formulas Cheat Sheet

### Sum to Product Formulas Cheat Sheet

### Cofunction Formulas Cheat Sheet

### Unit Circle

### Inverse Trig Functions

### Trig Cheat Sheet PDF

Many of the formulas used in trigonometry are also found in algebra, calculus and analytic geometry. But trigonometry also has some special formulas usually found just in those discussions. A formula provides you a rule or equation that you can count on to work, every single time. Trigonometry formulas gives a relationship between particular quantities and units. The main trick to using formulas is to know what the different letters represent. In the formulas given here, you have: *r* (radius); *d*(diameter or distance); *b* (base or measure of a side); *h* (height); *a*, *b*, *c* (measures of sides); *x*, *y* (coordinates on a graph); *m* (slope); *M* (midpoint); *h*, *k* (horizontal and vertical distances from the center); *θ* (angle theta); and *s* (arc length). The formulas particular to trigonometry have: sin (sine), cos (cosine), and tan (tangent), although only *sin* is represented here.