$\frac{4^{\frac{3}{2}}-4-4}{4^{\frac{3}{2}}-8}$

$\frac{x^2+18x+81}{x^3-27}$

$3y=\frac{dy}{dx}+x^2$

$\lim_{x\to\infty\:}\left(2x^2e^{-x}\right)$

$\left(3m+5\right)\left(3mn-2\right)$

$1+\frac{1}{5}x+\frac{6}{50}x^2+\frac{66}{750}x^3+\frac{1056}{15000}x^4$

$\left(\:7t^2\:\:+\:\:\:\:2lt\:\:-\:\:7l^2\:\:\:+\:\:10\right)\:\:+\:\:\left(\:8l^2\:\:-\:\:\:\:2lt\:\:-\:\:13t^2\:\:\:+\:\:6\right)$