LaTeX Math Font Size

[Augustinus Sextus]

Program: An open source SRS Program (for memorizing) integrated with LaTeX Anki (leads to Anki Website)

Situation: I always use LaTeX math environment [$]...[/$] for a lot of math equations, but the image produced is always bigger than necessary and sometimes it's annoying, is there anyway to change individual LaTeX math equation size?
if can't then could you give me the preamble script so all the result is the same in size.
please give me an example so I can use it ( because I'm not familiar with programming )

Resource:
'configure LaTeX.py' code:
from anki import latex
latex.latexDviPngCmd = ["dvipng", "-D", "150", "-T", "tight"]
latex.latexPreamble = ("\\documentclass[12pt]{article}\n"
"\\textwidth 12cm\n"
"\\usepackage{amsmath,amsthm,amssymb,enumerate }\n"
"%\\input completePathToYourMacros (remove percent to enable this)\n"
"\\usepackage[utf8]{inputenc}\n"
"\\pagestyle{empty}\n"
"\\begin{document}"
"\\begin{center}")
latex.latexPostamble = ("\\end{center}"
"\\end{document}")