Differentiate w.r.t. r
12
Evaluate
12r
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\frac{\mathrm{d}}{\mathrm{d}r}(12r)
Combine 9r and 3r to get 12r.
12r^{1-1}
The derivative of ax^{n} is nax^{n-1}.
12r^{0}
Subtract 1 from 1.
12\times 1
For any term t except 0, t^{0}=1.
12
For any term t, t\times 1=t and 1t=t.
12r
Combine 9r and 3r to get 12r.
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