$\left(-5m+3n\right)\left(-5m-3n\right)$

$x^2+16x+1=0$

$\left(x+1\right)\left(x+2\right)+\left(x+2\right)\left(x+3\right)-2\left(x+5\right)\left(x+2\right)-2x$

$-x+2\ge0$

$\frac{dy}{dx}=\frac{\left(x-y\right)}{\left(2+y-x\right)}$

$12^2+42$

$\left(x^{2}y-9\right)\left(x^{2}y+13\right)$