$x-15=-34$
$x^2-20x+200$
$\lim_{x\to1}4x^2$
$-\left(-3+15-2\right)$
$\int\ln\left(s\right)\cos\left(s\right)ds$
$9\left(3x-1\right)^2+2x^2\left(1-3x\right)^2$
$\int\frac{e^t}{e^t+4}dt$
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