$\left(3x^2y+8xy^2\right)dx+\left(x^3+8x^2y+12y^2\right)dy=0$

$\int\frac{5x^2+3}{x^2\cdot\left(x^2+2\right)}dx$

$x\frac{du}{dx}=2xe^{x}-y+6x^{2}$

$5x\:-2\:por\:x=1$

$\int-100sin\left(10x-6\right)dx$

$\frac{x+2}{x^2+7x+12}$

$28\:-\:\left(6\:-\:11\right)\:+\:\left[\:27\:-\:\left(2\:+11\:-\:8\right)\:+\left(-\:15\right)\right]$