$\left(a+b\right)^2+12k\left(a+b\right)+36k^2$
$\frac{\sec v}{\cos v}-\frac{\tan v}{\cot\theta}-1$
$\frac{31}{45}x^{-1}.\:\frac{2}{1}$
$4x^2-2y^3=k$
$x^2+1\le4x-3$
$x^2-y+xy=x+1$
$\frac{\left(x^3-2x^2-3x-4\right)}{x^2+1}$
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