$k^3-r^3=\left(k^2+r\right)\left(k-r^2\right)$
$\left(4x-3\right)^2$
$-9^3$
$\int_z^{x+z}xdy$
$y=\left(1+\frac{1}{x}\right)^x$
$\left(\sqrt{a}\right)^{-1}$
$\left(8x^2+15\right)^2$
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