y=sin(2x)-cos(0.4x)

and give me an explanation so i would understand it too.

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- Aug 27th 2008, 05:35 PMtupacHELP ME FIND A PERIOD FOR THIS GRAPH
y=sin(2x)-cos(0.4x)

and give me an explanation so i would understand it too. - Aug 27th 2008, 06:17 PMicemanfan
The period of the sin(2x) function is $\displaystyle \pi$ and the period of the cos(0.4x) function is $\displaystyle 5\pi$ so when combined the period of the composite function is $\displaystyle 5\pi$.