# The Three Main Trigonometric Functions

- Author:
- Kenneth

- Topic:
- Functions, Trigonometric Functions

The three main trigonometric functions are sine, cosine, and tangent. Sine is abbreviated as , cosine is abbreviated as , and tangent is abbreviated as . Don't worry if they seem intimidating at first. You'll get the hang of them.

You might have already seen these buttons on your calculator. Trigonometry is used for many other branches of math. That's why it is important for you to learn Trigonometry before venturing the harder math levels, such as Precalculus and Calculus.

*a*above, you can use the expressions

*a*with the sides of the triangle.