$6x^4-15x^3+21x$
$-33-\left(-18\right)$
$\int x^2\left(x^2-10000\right)dx$
$\int_{-1}^3\frac{3}{x^4}dx$
$f\left(x\right)=3\left(7-x^2\right)$
$\int cos^7\left(\frac{x}{a}\right)dx$
$6x-6=48$
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