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allow me to draw graphs, lines, curves such as parabolas, set intervals with sliding bars etc.

I have tried geogebra but it is very limited and is a pain to use. For example, you cannot set a line to have a particular gradient, you can only draw a line and then measure the gradient afterward. And to plot parabolas, you cannot plot equations but rather do it in a microsoft paint style.

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    $\begingroup$ You can try sagemath or Wolfram-alpha(to some extent) $\endgroup$ – Emre May 11 '16 at 8:24
  • $\begingroup$ on internet everything is free, so take advantage of the progress. $\endgroup$ – reuns May 11 '16 at 8:28
  • $\begingroup$ try link $\endgroup$ – user5954246 May 11 '16 at 8:32
  • $\begingroup$ You can indeed plot parabolas via equations in GeoGebra, just as you can enter the equation of a line to plot it. Just type them in. $\endgroup$ – amd May 11 '16 at 8:39
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    $\begingroup$ Sorry for the long delay. Select the “Algebra” app in the online version of geogebra, and you’ll get a tool that’ll let you type equations in and graph them. You’ll still have all of the interactive geometric tools, too. $\endgroup$ – amd May 20 '16 at 5:56
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Desmos is an excellent graphing calculator, it's very easy and intuitive to use. It also implements derivatives and, since the last update, integrals too.

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