$\int15x^2e^{x^3}dx$
$b^2-16$
$\:x^2-10x+21$
$\frac{4x^4-2x^3+3x-2}{2x^2-1}$
$\int\left(\left(4x+1\right)\cdot\left(2x^2+x+1\right)\right)dx$
$-8+-237$
$7y-21$
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