$\lim_{x\to0}\left(\frac{\cot\left(x\right)-\frac{1}{x}}{x}\right)$

$y^{10}-x^{10}$

$n\left(n-1\right)+3\left(n-1\right)$

$36r^2-84r+49$

$\lim_{x\to-3}\left(\frac{x^3+x^2-6x}{x^2-3x}\right)$

$\left(-35\right)-\left(-60\right)-\left(+17\right)-\left(+42\right)-\left(-21\right)$

$\lim_{v\to\infty}\left(\frac{\sqrt{v}}{\left(\log\:\left(v\right)\right)^3}\right)$