$\int_{-4}^0\left(-x\right)dx$
$16m^4-24m^2n^2+9n^4$
$\int\frac{1}{x\left(x+3\right)^2}dx$
$x+5+2x+2$
$\frac{1}{2}x-19.7=-4.7$
$\int x\left(\frac{x^3+x}{x^2}\right)dx$
$\int\sec\left(\frac{x}{2}\right)dx$
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