$\left(x^3+5\right)^2-3\left(x+5\right)^3$

$\left(x+0.8\right)\left(x+0.2\right)$

$\lim_{h\to0}\left(\frac{\left(4+h\right)^3+643}{h}\right)$

$\left(\sec\cdot\sec\cdot\sec\cdot\sec\right)$

$\lim_{x\to0}\left(\frac{t}{\sqrt{t+1\:-\sqrt{1+t}}}\right)$

$\sqrt[4]{25x^2y^2}$

$1+\sqrt{5}^2$