$$ y=x^{12} $$
$$ y=4ax^2+9bx+7c $$
$$ f(x)=\int_{-\infty}^x e^{t^2}dt $$
$$ \Large f=b_o+\frac{a_1}{b_1+\frac{a_2}{b_2+\frac{a_3}{b_3+a_4}}} $$