You have studied three different trigonometric ratios: the sine, the cosine, and the tangent. These three ratios are closely related, and you have already seen that . It is time to introduce other members of the family of trigonometric ratios.
Given the ABC, you can identify them all:
In any right triangle, we have a total of six different ratios of sides. We have already given names for three of them:
The ratio between ...