$-2^2-8x-2+1$

$\lim_{x\to0}\left(e^{3x}-3x\right)^{\frac{1}{x}}$

$x\frac{1}{2}+y\frac{1}{2}$

$\lim_{x\to\infty}\:-2^{x-1}$

$\int\left(x^2\left(x^2-9\right)^{\frac{3}{2}}\right)dx$

$m^4\left(b+3\right)\:+\:m\left(b+3\right)\:+\left(b+3\right)$

$\int\frac{12r^3}{\sqrt{5-r^4}}dx$