$\lim_{x\to-\infty}\left(-1+\frac{5x+6}{\left(x-2\right)^2}\right)$

$\left(3x+8y\right)\left(3x-8y\right)$

$\left(\frac{3}{4}x-y\right)^2$

$\lim_{x\to1.1}\left(\frac{x^3-1}{x-1}\right)$

$4x^2-96x+120=0$

$\int_a^b\cos\left(u\left(x\right)\right)u\left(x\right)du$

$\left(x-25\right)\left(x+5\right)$