Nope, I just saw it somewhere and really looks cool
You can use \mathop{{\int\!\!\!\!\!\int}\mkern-21mu\bigcirc}{}
This yields $\displaystyle \mathop{{\int\!\!\!\!\!\int}\mkern-21mu\bigcirc}{}$
I mean
You can use ImageShack
It's the best way to upload & plug the images to the forum
3^(3x +4).18^(-x-2)/24^(x+3).4^(-2x-1)
$\displaystyle \frac{3^{3x +4}.18^{-x-2}}{24^{x+3}.4^{-2x-1}}$
which is generated by:
[tex]\frac{3^{3x +4}.18^{-x-2}}{24^{x+3}.4^{-2x-1}}[/tex]
21^(3x+1).7(2-x)/49^(x-1).27^(x-4)
$\displaystyle \frac{21^{3x+1}.7^{2-x}}{49^{x-1}.27^{x-4}}$
which is generated by:
[tex]\frac{21^{3x+1}.7^{2-x}}{49^{x-1}.27^{x-4}}[/tex]
RonL