$3a+\left(-5a\right)+a$
$\left(3a^3-\frac{1}{a^2}\right)^n$
$13x^2-12x+3=0$
$\int\left(e^{-3x}\cdot\left(4-e^{-3x}\right)^2\right)dx$
$20+90+513$
$\int\left(4x^2+2x\right)\left(8x+2\right)dx$
$\int x ^ { - 2 } e ^ { - 2 } d x$
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