$2\tan-\sec^2$

$8-\frac{8}{2}+7^2$

$\frac{dy}{dx}+3\left(x+1\right)^{-1}\cdot y=4\left(x+1\right)^{-2}$

$\frac{2}{3}m^3-\frac{7}{3}mn^2-\frac{2}{9}n^3+\frac{5}{6}m^2n\:\cdot\:\frac{3}{4}m^2n^4$

$\left(x^{11}y^{-2}\right)^4$

$\left(\frac{2^{-4}}{2^{-2}-2^{-3}}\right)^{-2}$

$b^{2}+14b+42$