$\left(12x^3+3x^2-7x\right)+\left(x^3-8x^2+3x\right)$
$\lim_{x\to1.1}\left(\frac{4x^2-x-3}{x-1}\right)$
$\sec\left(x\right)\cdot\cos\left(\frac{t}{2}\right)$
$\frac{3w^5}{5w^3}$
$81x^4-72x^2+16$
$2^2\cdot5^3$
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