$\left(x^4y^6+2x\right)\cdot\left(x^4y^6-2x\right)$

$\left(-1+4y\right)\left(5\right)$

$\frac{\left(4a^3-8a^2b\right)}{\left(3a^2x-6abx\right)}$

$\lim\:_{x\to\:\:1}\left(\frac{x^2-1}{\sqrt{x+3}-2}\right)$

$x\sqrt{x^2}+1$

$\int_{\frac{x}{2}}^{2x}3\cos\left(x\right)dx$

$\frac{dy}{dx}=sin^2xcos^2y$