Differentiate w.r.t. x_30
-\frac{1818}{x_{30}^{2}}
Evaluate
\frac{1818}{x_{30}}
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-1818x_{30}^{-1-1}
The derivative of ax^{n} is nax^{n-1}.
-1818x_{30}^{-2}
Subtract 1 from -1.
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