### Home > A2C > Chapter 13 > Lesson 13.1.1 > Problem 13-8

13-8.

Show that sin() only if

*is an integer multiple of*

*.*

Graph the equations = sin (

*=*

*) on graphing paper or use Desmos calculator.*

Where are the two equations equal?

Use the Desmos calculator below to graph the equations.

Click the link at right for the full version of the eTool: *13-8 HW eTool*