$\int_{-\infty}^{-1}\left(xe^{x^2}\right)dx$
$\frac { - t ^ { 3 } + 3 t ^ { 2 } - 9 t } { 4 }$
$\frac{1}{ab}-a^2b^2$
$4w^{2}-28w+49$
$\left(f\cdot g\right)\left(\frac{3}{2x-1}\right)\left(\frac{2}{x}\right)$
$3\sin\left(a\right)-7=-2-2\sin\left(a\right)$
$16a^2+4a+4$
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