$4+20m+25m^2$

$\left(-90\right)+\left(-12\right)+\left(-34\right)+\left(-68\right)$

$2x^3y-4x^2y^2+8xy-16y^2$

$\frac{\left(-6x^5y^4\right)^5}{\left(c^4\right)^5}$

$9-8\left(2x\right)-\left(2x\right)$

$\left(\frac{1}{2}x^{-5}y^{\frac{3}{4}}-\frac{3}{4}x^{\frac{3}{5}}z^{-6}\right)$

$\lim_{x\to\infty}\left(\frac{\left(x\right)}{sin\left(x\right)}\right)$