$\sqrt{81a^{12}}$

$\frac{x^2-2x-5}{x+1}$

$\left(x^2+5\right)\:\left(x^2+20\right)$

$27^3+6n^6$

$\frac{16x^3}{4x}$

$\frac{csc\theta\:}{sen\theta\:}+\frac{sec\theta\:}{cos\theta\:}=csc^2\theta\:\cdot\:\:sec^2\theta\:$

$\int\left(\tan\left(x\right)\cdot\sec\left(x\right)^4\right)dx$