$15x^2-23x+4$
$21-\left(-21\right)$
$\frac{dy}{dx}=\frac{2y}{\left(1+x\right)\left(1-x\right)}$
$3x+1-x=3$
$( t - 10 ) ( t + 9 )$
$\left(2m^3\right)^{-2}\:.\:-2m^{-2}$
$\left(m-2n-p\right)^2$
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