$56x-14x^2+21x^3$
$u^2-5u$
$x\left(x^2-x\right)$
$cosecx\left(cosecx-cotx\right)$
$\frac{3}{\left(x-2\right)\left(x+1\right)}$
$\cos\left(x\right)^2=3$
$x^2-5x+5=0$
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