Differentiate w.r.t. b
-30
Evaluate
-30b
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\frac{\mathrm{d}}{\mathrm{d}b}(-30b)
Combine b and -31b to get -30b.
-30b^{1-1}
The derivative of ax^{n} is nax^{n-1}.
-30b^{0}
Subtract 1 from 1.
-30
For any term t except 0, t^{0}=1.
-30b
Combine b and -31b to get -30b.
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