$4x^3y^2\cdot3x^{-4}y^{-3}$

$\left(x\:-8\right)\left(w+5\right)=14$

$\left(-4\right)^4\cdot\left(\left(-4\right)^4\right)^3$

$1^2+4x$

$\lim_{x\to0}\left(\frac{tan0}{\sin\left(0\right)}\right)$

$\frac{dy}{dx}=3\cos\left(7x\right)$

$\frac{dy}{dx}=\frac{1}{x^2};y\left(1\right)=5$