$\left(-u^4w^9x\right)^2$

$\left(-6-5a^6+6\right)-\left(5-5-5a\right)$

$a^2+m^2-46^2-2am$

$\frac{144m^4-900n^8}{12m^2-30n^4}$

$\frac{d^3}{dx^3}\left(-\frac{1}{24}x^{-4}-\frac{3}{20}x-x^3+\frac{5}{18}\right)$

$\lim_{x\to+0}\left(x.ln\left(3^x-1\right)\right)$

$x\sqrt{1+y^2}\:+y\sqrt{1+x^2}\frac{dy}{dx}=0$