はむっ
<img src="http://home.wakatabe.com/ryo/cgi-bin/mimetex.cgi?f(x)=\int_{-\infty}^xe^{-t^2}dt">

<img src="http://www.forkosh.com/mimetex.cgi?c=\sqrt{a^2+b^2}" alt="" border=0 align=middle>

<img src="http://www.forkosh.com/mimetex.cgi?\depth~\Large f=b_o+\frac{a_1}{b_1+\frac{a_2}{b_2+\frac{a_3}{b_3+a_4}}}"  style="Vertical-Align:-55px"    alt="" border=0>