Evaluate
\frac{u\left(1-t\right)\left(3u^{2}+u-9\right)}{5\left(u-3t\right)\left(1-r^{2}\right)}
Expand
\frac{3tu^{3}+tu^{2}-9tu-3u^{3}-u^{2}+9u}{5\left(3t-u\right)\left(1-r^{2}\right)}
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