$\frac{x^3}{y^{-7}}$
$\int_0^{\frac{\pi}{4}}\sec^2t\:dt$
$5x^4\cdot2$
$\left(4m\:-n\right)^3$
$4a^2-8ab^2+4b^4$
$\left(9-2y^3\right)^2$
$4x-2^3$
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