$\int x^2\left(2x^3-5\right)^8dx$

$\lim_{x\to-8}\left(\frac{\tan\left(x^2-64\right)^2}{\left(x+8\right)^2}\right)$

$\int t^{2\:}sen\left(at\right)dx$

$\int tnxdx$

$\int_0^{\frac{\pi}{2}}2cos\left(x\right)\sqrt{1+3sin\left(x\right)}dx$

$f\left(6\right)=6^3-4\cdot6^2$

$\frac{-2z+2}{z+6}$