$x^2-12x+16$

$\left(gx-6\right)\left(gx+6\right)$

$\lim_{y\to0}\left(\frac{sen\left(1-cosy\right)}{y^2}\right)$

$\lim_{x\to0}\left(\frac{\ln\left(\tan\left(x\right)\right)}{\ln\left(\sin\left(x\right)\right)}\right)$

$2\log_b\left(x\right)+.5\log_b\left(x+4\right)$

$\frac{4}{0}\cdot\frac{0}{10}$

$\int\frac{5x+2}{x^2+4x+4}dx$