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\documentclass[a4page]{article}
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\usepackage[T1]{fontenc}
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\usepackage[utf8]{inputenc}
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\usepackage{lmodern}
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\usepackage[parfill]{parskip}
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\usepackage{amsmath,amssymb}
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\usepackage{fullpage}
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\usepackage{graphicx}
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\usepackage{pythontex}
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\title{sympy on cocalc}
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\author{cocalc}
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\begin{document}
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$2^{20}-1 = \pycon{2**20-1}$
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\begin{sympyblock}
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var('x, y, z')
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z = x + y
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f2 = sin(2*x**2).diff(x)
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f2pi = f2.subs({x : pi})
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\end{sympyblock}
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$$f_2(\pi) = \sympy{f2pi} \approx \sympy{f2pi.n(32)}\ldots$$
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\begin{sympyblock}
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phi = Symbol(r'\phi')
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h = Integral(exp(-phi**2), (phi, 0, oo))
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\end{sympyblock}
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\[\sympy{h}=\sympy{h.doit()}\]
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\begin{pylabcode}
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x = linspace(0, pi, 1000)
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plt.plot(x, 2*sin(x**2), label='$2 sin(x^2)$')
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plt.plot(x, cos(x), label='cos(x)')
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savefig("plot.pdf")
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\end{pylabcode}
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\begin{center}
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\includegraphics[width=0.85\textwidth]{plot.pdf}
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\end{center}
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\end{document}
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