$81x^2-12x+36$
$\left(-6\right)\left(-5\right)$
$\left(4x^{n+4m}\right)\left(-3x^{n-5m}\right)$
$\sqrt{9.9\cdot10\cdot1,01\cdot10^2\cdot1.0001\cdot10^4+1}$
$2-4z+8z$
$5x^3y-3x^7=-15^{10}$
$\frac{dy}{dx}=\frac{1}{x+y+3}$
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