$\int\frac{\sqrt{9-x^{2}}}{x^{4}}dx$
$\left(\frac{1}{2}a^2+8\right)\left(\frac{1}{2}a^2-4\right)$
$\int\frac{x}{\sqrt{7+6x-x^2}}dx$
$\frac{1}{w+2}-\frac{1}{w}-\frac{1}{2}=0$
$\int\left(\frac{1}{e^{-t\:}-1}\right)dt$
$\frac{1}{\sin\left(a\right)}$
$\frac{pq^{-3}r^{-4}}{3v^{-5}}$
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