$\int\frac{x^2}{\left(2+x^3\right)^2}dx$
$3-x<5+3x$
$50x^2+220x+242$
$\frac{\left(x+3\right)\left(x-3\right)}{x+2}$
$9x^2+30x+9$
$\left(-.75+1.75i\right)^2$
$2\left(d-4\right)+1$
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