$5-\left(-12\right)-8+6\left(+5\right)+10-5-\left(-9\right)+3$

$\int_{-1}^2\left(\frac{5y}{y^2-y-6}\right)dy$

$\frac{\left(9x-6\right)^3}{\left(27-3x\right)^2}$

$4x^4y^3+8x^3y^4$

$\lim_{x\to\infty}\left(\frac{e^x}{4^x}\right)$

$\int t^2.sen^2t.dt$

$\left[\frac{1}{3}\right]^{-\left[\frac{1}{9}\right]\left[\frac{1}{3}\right]}^{-\left[\frac{1}{9}\right]\left[\frac{1}{3}\right]}^{-3}$