In 1415, use the vertical line to identify graphs in which y is a function of x.

Module 2 Section 2.1: Properties of the Trigonometric Functions Recall the six trigonometric functions; y x y sin( )= , cos ( ) , tan( )= r r x csc( )= r , sec( )= r , cot( )= x y x y If we consider the unit circle then in each of these cases, r =1. Section 5.3...