$\left(6z-7\right)\left(6z+3\right)$

$\left(\frac{x}{4}+\frac{y}{3}\right)\left(\frac{x}{4}-\frac{x}{3}\right)$

$\int2xe^{\left(2x+\pi\right)}dx$

$x^2y+36xy$

$\int\left(\frac{x^2}{\sqrt{a^2}+\sqrt{b^2}}-\frac{3x}{\sqrt{a}}-5\sqrt{b}\right)\:dx$

$9x^2-36xy-36y^2$

$36x^2-144x+8$