Evaluate
\frac{2w^{4}\left(ab\right)^{3}}{3}
Differentiate w.r.t. b
2b^{2}a^{3}w^{4}
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\frac{-2a^{3}b^{3}w^{4}}{-3}
Cancel out 2ab^{4}w^{4} in both numerator and denominator.
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