$\int\frac{x^2+11x+15}{x^3+3x^2-4}dx$
$\sec^2\left(x\right)-6=-4$
$\left(3.1\right)\cdot\left(-30.6\right)$
$3d-1=-1+3d$
$1.753\cdot2.9$
$3-4\left(x+2\right)+\frac{5}{4}\left(x+2\right)\left(x-1\right)$
$x\left(e^{x^2}+2\right)$
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