$\int\frac{\left(-6\right)}{\left(x^2\left(\sqrt{x^2-9}\right)\right)}dx$

$\left(m-12\right)\left(m+6\right)$

$\frac{17}{9}m^2n^2-\frac{11}{6}m^2n^2$

$9-\left(-3\right)^4:\left(-3\right)^3$

$2a^{3}b\left(3a^{2}b+ab^{2}\right)$

$y^22yx+x^2$

$\lim_{x\to\infty}\frac{\left(e^x-e^{-x}\right)}{\sin\left(x\right)\pi}$