$\int\frac{1}{2x^2\sqrt{9+4x^2}}dx$
$\int\frac{2}{\left(x^2+5\right)\left(x^2+2\right)^2}dx$
$x^2-50x+400$
$-\left(5+6+5\right)-\left(87-8-9+4\right)-3$
$t^2+7t$
$u^2-5u+2=0$
$5xb+5by-3ax-3ay$
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