$\left(x+3\right)^2-\left(x-3\right)^2-3\left(2x-1\right)$
$\frac{3x^2+2xy}{9x^2-4y^2}$
$\left(v-12\right)\left(v-7\right)$
$x-12\ge17$
$\sqrt[3]{1826.1}$
$\left(-4\right)\left(-4\right)+11+3-8$
$\arctan\left(\frac{\frac{1}{2}+1}{\frac{1}{2}-1}\right)+\arctan\left(\frac{\frac{1}{2}-1}{2}\right)$
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