$\int\frac{4x^2}{\sqrt{1-x^2}}dx$
$\left(xy^4\right)^2$
$-x^2+140x+3200$
$x\left(x+2\right)^2\left(x-2\right)^2$
$\int\left(a^2\right)\sin\left(2a\right)da$
$\frac{10}{\left(2-x\right)\left(1+x^2\right)}$
$3x^2+10x-9$
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