$\ln\left(x-13\right)+\ln\left(x+13\right)$

$( 7 u ^ { 3 } - 2 u w ^ { 5 } ) ^ { 2 }$

$\int_{\infty}^{\pi}\sin^4\left(x\right)\cos^2\left(x\right)dx$

$5\left(x+4\right)-3\left(x+10\right)$

$\left(m^6-1\right)\left(m^{12}+m^6+1\right)$

$\lim_{x\to4}\left(5x\right)$

$-6-5x^3-3y^2+4x^3$