$\left(x^8\:+\:1\right)\left(x^8\:-\:1\right)$
$\lim_{x\to4}\:\sqrt{x^2-2x+3}$
$a+\frac{1}{4}a$
$\lim_{x\to0}\left(\frac{3sin\left(5\pi x\right)}{cos\left(\pi x\right)+x}\right)$
$\frac{7}{x},\:a=-3$
$\left(4+\sqrt{x+y}-4-\sqrt{x}\right)$
$12ab^3c^5-16abd+20abcd$
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