$\left(a-1\right)\left(a+12\right)$
$\left(a+2\right)^2-\left(a-1\right)^2$
$\lim_{x\to4}\left(\frac{x-4}{x}\right)$
$\int_1^{\sqrt{3}}5\left(\arctan\left(\frac{1}{x}\right)\right)dx$
$\left(a^{-4}\right)\left(b^8\right)\left(c^{-2}\right)$
$\sqrt{7+4\sqrt{3}}.\sqrt{7-4\sqrt{3}}$
$1+2\sin x\cos x=1$
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