Factor
\frac{x^{5}}{80}-\frac{y^{4}}{81}+С
Evaluate
\frac{x^{5}}{80}-\frac{y^{4}}{81}+С
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\frac{81\int \frac{x^{4}}{16}\mathrm{d}x-y^{4}}{81}
Factor out \frac{1}{81}.
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