$\left(6^{2}ab^{3}a^{3}\right)^{4}$
$8+x-22$
$\lim_{x\to2}\left(\frac{x^2-4}{e^2-2}\right)$
$\left(4-2cosx\right)^2$
$4sinx+4=6$
$\left(3x-5\right)\left(x+2\right)$
$3-7b+2+5b$
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