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Take a look at Geogebra http://www.geogebra.org. You basically have a app that works like a calculator, and you can export your graphs to LaTeX PGF/TikZ. You may want to look at a demo https://www.youtube.com/watch?v=beUSEBoci5c&list=UUiaUNF5GUwJ8owZq5Qgw0ZA of using Geogebra and ShareLaTeX to see how simple it is.