$8-7\cdot3$
$\left(x^3-x^4\right)\:\left(x^3-x^4\right)$
$\int\frac{1}{\sqrt{21+4x-x^2}}dx$
$x^2-2x+1=9$
$\left(\frac{1}{2}x+7\right)\left(\frac{1}{2}x-12\right)$
$5x-2<10x+8$
$\left(a^2^m-b^2^n\right)\left(a^2^m+b^2^n\right)$
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