$8ax^2-2a$
$\left(a^2-1\right)^3$
$1\cdot9$
$\int\frac{13x^2}{\left(x-5\right)\left(x-4\right)\left(x-4\right)}dx$
$90+2\cdot11$
$\lim_{x\to60}\left(\cos\left(2x\right)+\sin\left(x\right)-\cos\left(x\right)\right)$
$-x-\frac{2}{3}x-\frac{1}{4}x$
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