$81\cdot2$
$\left(2x^3-5\right)\left(2x^3+5\right)$
$2x^2-2x=40$
$x^9-29x^7+100x^5$
$\frac{dy}{dx}=\frac{7y}{\left(8+x\right)}$
$4c^2-12c+9$
$3\:cos\left(a\right)-1=0$
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