$\left(-38\right)-\left(-21\right)$
$\int\frac{x-1}{\left(2x-1\right)\left(x-2\right)}dx$
$2x^3+x^2-4x-3$
$3\left(x-3\right)-2<x+12\left(x+2\right)$
$\int\frac{1}{\sin^2u+1}du$
$-0.054+0.012$
$6x^2-4x^2+x^2$
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