# Math Help - HELP ME FIND A PERIOD FOR THIS GRAPH

1. ## HELP ME FIND A PERIOD FOR THIS GRAPH

y=sin(2x)-cos(0.4x)
and give me an explanation so i would understand it too.

2. The period of the sin(2x) function is $\pi$ and the period of the cos(0.4x) function is $5\pi$ so when combined the period of the composite function is $5\pi$.