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

$\frac{3x^4+6x^3-x^2}{x+a}$

$12\:+\:n\:=\:13$

$-\left(7+4\right)+14-\left(-5+6\right)+\left(4+7-13\right)$

$\log\left(d\right)+z\log\left(g\right)$

$\left(-17x-24y-2z\right)+\left(-5x+24y+2z\right)$

$y\ln\left(x\right)\frac{dy}{dx}=\frac{y-1}{x}$