Differentiate w.r.t. g
-\frac{78}{g^{7}}
Evaluate
\frac{13}{g^{6}}
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-6\times 13g^{-6-1}
The derivative of ax^{n} is nax^{n-1}.
-78g^{-6-1}
Multiply -6 times 13.
-78g^{-7}
Subtract 1 from -6.
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