$\int e^t\cdot sec^2\left(e^t\right)dt$

$\frac{tan\left(x\right)}{-cot\left(x\right)}$

$2\sqrt{-72}+3\sqrt{-32}$

$4cost^2$

$2.5+11.5$

$\int_6^{\infty}\left(\frac{5x^2}{e^{\frac{1}{3}}}\right)dx$

$\lim_{x\to\infty}\left(\left(\frac{2x-\cos\:\left(x\right)}{x}\right)\right)$