$57m-53n-25m-n+20z-19n+5n$

$\cos\left(x\right)+\frac{\sin\left(x\right)}{1+\cos\left(x\right)}=\csc\left(x\right)$

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

$-48x^4-32x^3-16x^2-16x-576$

$\lim_{x\to0}\left(\frac{x^2-1}{x^3-1}\right)$

$4\cdot x-4=3\cdot x+8$

$\left(3m^{n+2}-4n^{2n+3}\right)^2$