$\int tan\left(11x\right)sec^2\left(11x\right)dx$

$9a-3a+4$

$\frac{cos^2x}{\left(1-sinx\right)^2}$

$tan\left(\pi\:+\theta\:\right)=tan\theta\:$

$6.23-\left(-3.62\right)$

$\frac{dy}{dx}=-5\cdot x-3\cdot x\cdot y$

$\int\left(x^4\right)\left(\ln\left(x\right)\right)^2dx$