$\left(x^2y^3+x\right)dx\:+\:\left(x^3y^2\right)dy\:=\:0$

$5x^3+10x^2y^2+5x^2y$

$\frac{1}{0.4x^3+0.16x^2+x}$

$3y^2+\left(12-5y^2\right)$

$\left(-5\right)\left(-2\right)-\left(-4\right)\left(-3\right)$

$\int sen\left(lx\right)dx$

$-0.063\left(5\right)^2+1.62\left(5\right)+9.5$