$81w^2-18w+1$
$\frac{x^3-27}{x^3+2x^2+6x-9}$
$x^2+40+400$
$\frac{1+\frac{1}{\cos^2\left(x\right)}}{\:1+\frac{\sin\left(x\right)^2}{\cos\left(x\right)^2}}$
$4x^2-2\cdot\sqrt{3}\cdot x$
$24ab^3-22b+9$
$x^2+x^2+49$
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