$3.5m^3n^2-4m^3n^2$
$\frac{2x+3}{2-x}\ge2$
$6\cdot10^3\cdot2\cdot10^4$
$\sqrt{168x^8y^{10}}$
$\left(+39\right)\left(+13\right)$
$\frac{\tan\left(x\right)+3\sin\left(x\right)+2}{\tan\left(x\right)-3\sin\left(x\right)+1}=2$
$n^2-6+9$
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