Differentiate w.r.t. I
-399
Evaluate
-399I
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\frac{\mathrm{d}}{\mathrm{d}I}(-399I)
Combine I and -400I to get -399I.
-399I^{1-1}
The derivative of ax^{n} is nax^{n-1}.
-399I^{0}
Subtract 1 from 1.
-399
For any term t except 0, t^{0}=1.
-399I
Combine I and -400I to get -399I.
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