Differentiate w.r.t. ε
\frac{99}{5\epsilon ^{0.8}}
Evaluate
99\sqrt[5]{\epsilon }
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0.2\times 99\epsilon ^{0.2-1}
The derivative of ax^{n} is nax^{n-1}.
19.8\epsilon ^{0.2-1}
Multiply 0.2 times 99.
19.8\epsilon ^{-0.8}
Subtract 1 from 0.2.
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