math - C++ library for drawing graphics -

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someone can suggest me good, free, easy use library c++ allow draw mathematical function in window microsoft windows? (e.g. parabola x^2+5x+3=0)

another wxwidgets-based option wxart2d, has got tons of features drawing mathematical functions curves, pass y=140*cos(x/20) + 80*cos(x*2/20) + 40*cos(x*4/20)" curve object , drawn, it's amazing! check out these screenshots there curves drawn equations in string format!


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