Evaluate
-\frac{1}{3ab}
Differentiate w.r.t. a
\frac{1}{3ba^{2}}
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\left(-3\right)^{-1}a^{-1}b^{-1}
Expand \left(-3ab\right)^{-1}.
-\frac{1}{3}a^{-1}b^{-1}
Calculate -3 to the power of -1 and get -\frac{1}{3}.
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