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r"""
=========================================
The difference between \\dfrac and \\frac
=========================================
In this example, the differences between the \\dfrac and \\frac TeX macros are
illustrated; in particular, the difference between display style and text style
fractions when using Mathtex.
.. versionadded:: 2.1
.. note::
To use \\dfrac with the LaTeX engine (text.usetex : True), you need to
import the amsmath package with the text.latex.preamble rc, which is
an unsupported feature; therefore, it is probably a better idea to just
use the \\displaystyle option before the \\frac macro to get this behavior
with the LaTeX engine.
"""
import matplotlib.pyplot as plt
fig = plt.figure(figsize=(5.25, 0.75))
fig.text(0.5, 0.3, r'\dfrac: $\dfrac{a}{b}$',
horizontalalignment='center', verticalalignment='center')
fig.text(0.5, 0.7, r'\frac: $\frac{a}{b}$',
horizontalalignment='center', verticalalignment='center')
plt.show()
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