Differentiate w.r.t. a
-\frac{18}{a^{4}}
Evaluate
\frac{6}{a^{3}}
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-3\times 6a^{-3-1}
The derivative of ax^{n} is nax^{n-1}.
-18a^{-3-1}
Multiply -3 times 6.
-18a^{-4}
Subtract 1 from -3.
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