$\left(-32x^2+y^3-224\right)\left(27x^2y+64x\right)$

$\frac{x^n}{6^nx^3}$

$-64+80+210$

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

$\left(x^3+x^6\right)^3$

$3\left(-7\right)^4\:-\:3\left(-7\right)^3\:-\left(-7\right)^2\:+\:3\left(-7\right)\:-\:1\:$

$\lim_{x\to0}\left(\frac{ax-\sin\left(ax\right)}{x^3}\right)$