$\int\frac{x^2+2x}{\left(x-1\right)}dx$

$\int\left(2-t^2\right)e^{\left(6t-t^3\:\right)}\:dt$

$\left(2x^2+5\right)\left(2x^2+4\right)$

$4x^7\cdot3x^8$

$y'+y\cdot cos\left(x\right)=5\cdot cos\left(x\right)$

$4x^3-8x^2\:\:entre\:2x$

$\left|1+\left(-83\right)\right|-37$