Is there a free graph plotting software for maths functions?

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Free graph plotting software for mathematical functions is available, with users recommending options like Gnuplot. The original poster seeks software that can display sketches for various functions. Several users confirm the existence of free tools and share links to resources. Gnuplot is highlighted as a reliable choice for graphing needs. Overall, there are multiple free options for plotting mathematical functions effectively.
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Dear all valuable experts,

I'm looking for a free based maths graph plotting software which could display a sketch for various or any kind of functions supplied.

Any idea if such software even exists?

Thanks in advance.
 
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I use this one
http://www.zdnet.com.au/downloads/0,139024478,10278409s,00.htm
 
Thank you so much guys.
 
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