$\int tan^2asec^2ada$

$\lim_{x\to2}\left(\frac{5}{\left(x-2\right)^2}\right)$

$6.5+11.6$

$\int8re^{\left(\frac{r}{3}\right)}dr$

$\left(1+\cos^2\left(x\right)\right)\cdot\tan^2\left(x\right)-\frac{1}{\cos^2\left(x\right)}$

$3\left(-1\right)^2\:-\:2\left(-1\right)-7$

$\int\frac{-7t}{e^{\left(9t\right)}}dt$