Differentiate w.r.t. z
\frac{9z^{8}}{23}
Evaluate
\frac{z^{9}}{23}
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9\times \frac{1}{23}z^{9-1}
The derivative of ax^{n} is nax^{n-1}.
\frac{9}{23}z^{9-1}
Multiply 9 times \frac{1}{23}.
\frac{9}{23}z^{8}
Subtract 1 from 9.
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