# Trigonometry

### Express Sine in Terms of Cotangent

Even though each trigonometry function is perfectly wonderful, being able to express each...

### Trigonometry For Dummies Cheat Sheet

Trigonometry is the study of triangles, which contain angles, of course. Get to know some...

### How to Recognize Basic Trig Graphs

The graphs of the trig functions have ma...

### How to Create a Table of Trigonometry Functions

The angles used most often in trig have trig functions with convenient exact values. Other...

### Commonly Used Values of Selected Trig Functions

When performing transformations in trig functions, such as rotations, you need to use the...

### Using the Method of Undetermined Coefficients

If you need to find particular solutions to nonhomogeneous differential equations, then yo...

### Classifying Differential Equations by Order

The most common classification of differential equations is based on order. The order of a...

### Defining Homogeneous and Nonhomogeneous Differenti...

In order to identify a nonhomogeneous differential equation, you first need to know what a...

### How to Use the Double-Angle Identity for Sine

The double-angle formula for sine comes from using the trig identity for the sine of a sum...

### Cotangent and Cosecant Identities on a Unit Circle

Starting with the Pythagorean identity,...