$\int_{\frac{\pi}{6}}^{\frac{5\pi}{11}}\left(\frac{x\cdot\arctan\left(x\right)}{\left(x^2+1\right)^2}\right)dx$

$\left(\frac{1}{\sqrt{k+1}}\right)\left(t-3\right)^k$

$\left(7ab\:-\:8c\right)\left(8c\:+\:7ab\right)$

$\left(x-2\right)\left(y+5\right)\left(x^2-n\right)$

$\left(5x+3z\right)\left(5x-3z\right)$

$\int xd^{-3x}$

$2w+5=4w+13$