$\left(m-n-1\right)\left(m-n+1\right)$
$-13+9\cdot4-17\cdot0-7$
$\left(3x^3+4\right)\left(3x^3+20\right)$
$2x-4\le4x+2$
$\frac{2}{5}b^6+\frac{3}{10}b^4\:$
$x\left(x^3+5\right)-6$
$\frac{d}{dx}4x^2\:+\:xy\:+\:4y^2\:=\:9$
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