$\lim_{x\to-1}\left(\frac{6x^4+x^3+4x-1}{x+1}\right)$

$\left(2a+8\right)\:\left(2a+2\right)$

$2^3+4^0$

$\frac{5\left(3\right)+3}{3}$

$\left(-8a^2b\right)\left(-6a^3b^2+5a^2b^3-3\right)$

$\left(3x^y\right)\left(3y^x\right)$

$\lim_{y\to0}\left(\frac{y-\arctan\left(y\right)}{y-\sin\left(y\right)}\right)$