$\left(x-15\right)\left(x-5\right)$

$\lim_{x\to1}\left(\frac{x^3-2x^2-1}{x^3-1}\right)$

$-\frac{1}{\left(\infty+1\right)^2}$

$\int\frac{3x^2+4x+4}{x\left(x^2+4\right)}dx$

$\int\left(\sqrt[3]{\left(5x^3+3\right)}x^2\right)dx$

$\lim_{x\to0\:}\frac{cos\left(x\right)-1}{tan\left(x\right)}$

$\left(4a+3\right)^3$