$\int\left(x^2-3\right)e^{-5x}dx$
$\left(15-21i\right)^2$
$a^4-5a^2+9$
$-10n^2-5n+10$
$x\int_2^{x^2}sen\left(t^3\right)dt$
$3t\:+\:9\left(4t\:+\:6\right)$
$\left(7x\right)^3$
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