$8a^2b-ab$
$3x^5-15x^4-11x^3+55x^2-4x+20$
$2^{-2}\cdot2^3$
$\lim_{x\to\infty}\left(\ln\left(x\right)^{\frac{1}{x^2}}\right)$
$4a^2-64=0$
$\lim_{x\to3}\left(-\sqrt{x+5}\right)$
$-70+32x-6x=-18$
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