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Which is best graph software to plot the following functions?

2.5 + 10/Pi sin1/4.Pi.t

and

2.5 + 10/Pi ∑ 1/(2n-1) sin (2n-1)Pi.t/4

Limits for ∑ are: top = 20 bottom = n=1

I want to show the first 20 terms of this series.

I’m trying to show how Fourier series is made up off many trigonometric functions.

Can someone suggest a good program to use to plot these graphs?

Thanks

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# Best graph software ?

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