Eli
$$\Large \frac{ax^{2}+bx+c}{xy +z} = \int{0}^{1}\int{a}^{b}\int_{\frac{1}{2}}^{\frac{1}{5}}\Big[R(ax+by)+L(z^{2}+xy)\Big]{\rm d}z{\rm d}y{\rm d}x $$
$$\Huge \frac{1}{2} \ \triangle \nabla \sigma \Sigma \sum_{z=f}^{z=y}f(x,y,z) = \begin{pmatrix}
1 & 2 & 3\\
a & b & c \\
e & f& g
\end{pmatrix}$$
\[ \Huge \color{blue}{\int}_{\color{magenta}a}^{\color{purple}b} {\color{green}\frac{\rm {\color {maroon}d}}{{\rm \color{maroon}d}x}}{\color{red}{F}{\color{black}(}{\color{green}x}{\color{black})}}{\color{green}{\rm \color{maroon} d}x} {\color{gray}=} \color{red}{F}{\color{PineGreen}(}\color{purple}{b}{\color{PineGreen})} {\color {CadetBlue} -} \color{red}{F}{\color{RedViolet}(}\color{magenta}{a}{\color{RedViolet})}\]