$\left|\left(-4^3\right)\right|^2:\left(-4\right)^2$

$e^{4t}\left(\cos\:\left(2t\right)+\sin\left(3t\right)\right)$

$2x^2+12xy+18y^2$

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

$-3y^3+3x^2-x^2+7x^2-1-4+6y^3$

$z2-\:9\:=\:0$

$\frac{d^2y}{dx^2}-10\frac{dy}{dx}+25y=e^{5x}$