$2^5\:2^x$
$\sqrt{1}40$
$\frac{2^{n-1}}{5^n}$
$+74-15+4\left(+5-1\right)$
$\:\frac{\left(x-1\right)^{2n}}{9^n\left(3n+1\right)}$
$27-24x+4x^2$
$\lim_{x\to0}\left(cot\:x-\frac{1}{x}\right)$
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