$a\left(n\right)=a\left(1\right)+\left(n-1\right)$
$\left(400\right)^4$
$\left(2-3\sqrt{5}\right)\left(2+3\sqrt{5}\right)$
$27^2$
$\lim_{x\to0}\left(x\:cotx\right)$
$\int\frac{1}{20}x^2\:dx$
$x2-3x+\frac{7}{x+3}$
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