$\left(12x+5y+7\right)^2$
$\left(6a-12y\right)\left(6a-12y\right)$
$\int\left(\frac{e^{-y}}{1-e^{-y}}\right)dy$
$13x-21>5-x$
$\int\left(x\cdot\sin\left(\sqrt{a^2-x^2}\right)\right)dx$
$5^4\:x\:7^4$
$4x^2-81y^2$
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