$\left[\left(-4\right)+\left(-3\right)\cdot\left(-6\right)\right]$

$\int2x\:sen\left(4x\right)dx$

$\lim_{x\to\infty}\left(\ln\left(x\right)-\ln\left(1\:-x\right)\right)$

$\left(4y-3\right)\left(4y+3\right)$

$\int\frac{e^x}{\left(e^{2x}+1\right)\left(e^x-5\right)}dx$

$-\left(\frac{-25}{-5}\right)$

$\frac{\left(x^4-2x^3-2x^2-3\right)}{\left(x^2-2x+1\right)}$