$\int\frac{x^4-2x}{\left(x^2+1\right)}dx$
$\left(-\frac{2}{4}x^2a\right)\left(-\frac{3}{5}a^2x\right)\left(\frac{1}{3}xa\right)$
$\left(5x+3\right)^4$
$\sin^2x+5\sin x+4$
$x^2=8-5x$
$9x^2y^3+27x^3y^2$
$m^2n-4m^2+3mn^2-\left(-m^2n+3mn^2-2m^2\right)$
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