$\int\frac{4x+12}{\left(x-2\right)\left(x^2+4x+\right)}dx$

$1-\sen\theta\cdot\cos\theta\cdot\tan\theta=\cos^{2}\theta$

$\left(3x^2+x^3\right)\left(x+1\right)$

$da^2=-g$

$\lim_{x\to n}\left(\frac{\left(8x\right)}{\ln\:\left(n\right)+3n+7}\right)$

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

$x^2+9x-42$