How do I plot the figure of Fourier series under the different step?

Question:How do I plot the figure of Fourier series under the different step?

Posted: zhong chen 50 Product: Maple

October 29 2010

For a eqation such as y(t)=2*sin(3*t)

I want to solve its fourier series under the different step,

and plot corresponding figure like the picture below

How should i do?

help me please.

$tu$

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