Differentiate w.r.t. b
9
Evaluate
9b
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\frac{\mathrm{d}}{\mathrm{d}b}(9b)
Combine 6b and 3b to get 9b.
9b^{1-1}
The derivative of ax^{n} is nax^{n-1}.
9b^{0}
Subtract 1 from 1.
9\times 1
For any term t except 0, t^{0}=1.
9
For any term t, t\times 1=t and 1t=t.
9b
Combine 6b and 3b to get 9b.
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