$36k^6-1$

$\left(x^2+2\cdot x+10\right)\cdot\left(x^2+6\cdot x+10\right)$

$\lim_{x\to\infty}\left(n^{\frac{1}{x}}-1\right)x$

$\lim_{x\to4}\left(\frac{x-4}{x}\right)$

$-3x-3x^2$

$\left(-\frac{1}{3}\right)-\frac{3}{5}\cdot\:\sqrt[4]{-3^3}$

$\int\sec3x\left(sec3+tan3x\right)dx$