$\lim_{x\to\infty}\left(2x^3\right)$

$458-\left(185-\left(81\right)+91+\left(4-40+65\right)+\left(1\right)\right)$

$\left(y^2-10y\right)\left(y^2+10\right)$

$\left(\frac{n^4+2n^3+n^2}{4}\right).\left(\frac{16}{n}\right)$

$4y^2\:-\:x^8$

$\left(+12\right)-\left(-15\right)$

$1+\cot^2x=3$