$9y^2-100$
$4x^2+8x-40$
$\frac{d^2}{dx^2}\left(\frac{2}{t}\right)$
$6^{-5}\cdot6^7$
$4x^2-7x-4$
$\int_0^{\frac{t}{2}}e^{ux}\:dx$
$a^2+a^2-2a^2$
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