$\int e^{-3x^4}dx$
$100-8+\left(-5\right)+1-\left(-20\right)$
$\left(2b^3-7\right)^2$
$4a-2b;a=-1,b=0$
$\int\left(\frac{2x}{x-9}\right)dx$
$\lim_{z\to0}\left(\frac{\sin\left(z\right)}{z}\right)^{\frac{1}{z^2}}$
$3\left(3+7\right)$
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