$1-a^2b^4$
$-4x-2y-5x+7y$
$\left(x+1\right)\frac{dy}{dx}+2y=e^x\left(x+1\right)^{-1}$
$\left(\frac{5}{6}xy-\frac{2}{7}\right)^3$
$8\sin^2x+7\cos^2x=0$
$\left(3x^2\right)\left(3x^{-2}\right)$
$\int3t^5e^{-2t^6}dt$
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