$\left(a^2-1\right)\left(a^6+a^2+a^4+1\right)$
$\frac{4x^2-9}{2x-3}$
$2x-3y+x-y$
$\lim_{x\to3}\left(\sqrt{\frac{x^2+7}{4+x}}\right)$
$\frac{dy}{dx}=e^{5x-4y}$
$\frac{2\sin^2t+\sin t-3}{1-\cos^2t-\sin t}$
$\int\frac{x^3}{\left(x^3-64\right)}dx$
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