Differentiate w.r.t. z
-\frac{56}{z^{8}}
Evaluate
\frac{8}{z^{7}}
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-7\times 8z^{-7-1}
The derivative of ax^{n} is nax^{n-1}.
-56z^{-7-1}
Multiply -7 times 8.
-56z^{-8}
Subtract 1 from -7.
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