This is written as a fraction. Image caption, These three equations are true for all right-angled triangles. They are known as the three trigonometric ratios because they show how large one side ...

Sine and cosine are ratios that are defined in the context of a triangle's right angle, and they can be presented according ...

It's long been claimed impossible to use trigonometry to prove what is ... the relationship between the three sides of a ...

To visualize the trigonometric functions for these angles we draw imaginary right triangles in which one side has a length of 0. The triangle for 0 degrees is shown in Figure 20.55. From Figure 20.55 ...