Differentiate w.r.t. x_100
\frac{1}{8} = 0.125
Evaluate
\frac{x_{100}}{8}
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\frac{1}{8}x_{100}^{1-1}
The derivative of ax^{n} is nax^{n-1}.
\frac{1}{8}x_{100}^{0}
Subtract 1 from 1.
\frac{1}{8}\times 1
For any term t except 0, t^{0}=1.
\frac{1}{8}
For any term t, t\times 1=t and 1t=t.
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