$\lim_{x\to0}\left(\frac{x-1}{x-\sqrt{2-x}}\right)$

$\left(10w\:-\:15z\:\right)^2\:\:\:\:\:\:\:\:$

$\left(4m^5\right)^2-2\left(4m^5\right)\left(5n^6\right)+\left(-5n^6\right)^2$

$\frac{d}{dx}\left(\left(x+y\right)^3+\left(x-y\right)^3=x^4+y^4\right)$

$\left(4+a\right)\left(1-a\right)$

$\left(\sqrt{x}\:+\sqrt{5}\right)\left(\sqrt{x}-\sqrt{5}\right)$

$\left|-5\right|+\left|10\right|$