$\left(-7k+11\right)^2$
$\left(\frac{8}{4}\right)^3$
$16a^2-4b^2$
$9u^2-30uy+25y^2$
$\int\left(8z\sqrt{9-8z^2}\right)dz$
$\sqrt{3}\csc x-2=0$
$\left(15x^2y-3xy^2\right)^2$
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