# Sin, Cosine, & Tan Review and Tutorials

Brief Tutorial - Elementary Trignometric Functions

An elementary review of the properties of the trigonometric functions. What is the sine, cosine and tangent of 140º? Scientific Calculator required.

Trig Formula

A handy reference for the trigonometry formula.

Dr. Math Explains

How do you explain this concept? Look no further, the sin, cosine and tangent are made relevant with Dr. Math's explanations.

Beyond 90°

A tutorial to show you that supplementary angles have the same sine and opposite cosines.