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

13-8.

Show that sin (2*x*) = 2sin(*x*) only if *x* is an integer multiple of *π*. Homework Help ✎

Graph the equations *y* = sin (2*x*) and *y* = 2·sin(*x*) 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 Desmos calculator: Desmos