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Try this:
def compile_latex(s):
"""
Compile string `s` using LaTeX, and display a png picture of the output.
"""
from sage.misc.misc import tmp_dir, graphics_filename
from sage.misc.latex import _run_latex_, LATEX_HEADER
import os, shutil
base_dir = os.path.abspath("")
png_file = graphics_filename(ext='png')
png_link = "cell://" + png_file
tmp = tmp_dir()
tmp = tmp_dir('sage_viewer')
tex_file = os.path.join(tmp, "sage.tex")
tmp_png_file = os.path.join(tmp, "sage.png")
latex_code = LATEX_HEADER + '\n\\begin{document}\n' + s + '\\end{document}'
open(tex_file, 'w').write(latex_code)
e = _run_latex_(tex_file, png=True)
if e.find("Error") == -1:
shutil.copy(tmp_png_file, os.path.join(base_dir, png_file))
print '<html><img src="%s"></html>'%png_link
return
Then run it with compile_string('some math: $x=y$. Some more: $x^2 = y^2$.').
