$16a^2-b^4$

$\frac{2}{5x}-2\le-\:0$

$\left(4m^2n^3+\frac{2}{3}a^4\right)\left(2xy^3+\frac{1}{3}a^4\right)$

$\int\left(\frac{\left(5x^4\right)}{x^5-4}\right)dx$

$5\left(-1\right)^3\:+2\left(-1\right)^2\:\left(2\right)\:-\left(-1\right)\left(2\right)^2\:+4$

$3x^2-x\left(12x-4\right)$

$\int_{-2}^1\left(x^2-4\right)dx$