$\int e^{2x^3}dx$
$20+90+51+5$
$3xdx=4ydy$
$70y^8+30y^6$
$\int\frac{4x-x^2-1}{\left(x+2\right)\left(x^2+9\right)}dx$
$\lim_{b\to0}\sqrt[4]{1+b^3}$
$n\left(n-1\right)\left(1-x\right)^n$
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