$x+\frac{1}{y}=5$
$sen\:\left(x+y\right)$
$\sin\:\left(x+y\right)-\sin\:\left(x-y\right)$
$\left(x-7\right)^2<0$
$\sqrt[3]{x^2}-4\sqrt{x^3}$
$xa^2-xb^2$
$\frac{z^{-5}}{z^3}$
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