$\left(4x-2\right)\left(x+7\right)$
$\sin^2b\cdot\left(\cot^2b+1\right)=1$
$\left(3a^3\right)^2+2\left(3a^3\right)\left(8b^4\right)+\left(8b^4\right)^2$
$\left(4.10^{-3}\right)\left(2.10^{-2}\right)=8.10^5$
$13=\frac{x}{3}-4$
$\frac{3x-2}{2x^2+4x-6}$
$\frac{dy}{\:dx}-y^2=9$
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