$\frac{a^4+a}{a+1}$

$\left(7s^{\frac{7}{4}}5^{-\frac{5}{3}}\right)\left(-6s^{-\frac{11}{4}}t^{\frac{7}{3}}\right)$

$\frac{dy}{dx}-2xy=3x^2e^{x^2}$

$3xy+6x^2y+9xy^2$

$2x^2+160x-6600=0$

$\int\left(x-1\right)sen\pi\:\:xdx$

$\left(16.008+21.43\right)-\left(23.4-4.018\right)+\left(43-2.119\right)$