Differentiate w.r.t. r
19
Evaluate
19r
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\frac{\mathrm{d}}{\mathrm{d}r}(19r)
Combine 6r and 13r to get 19r.
19r^{1-1}
The derivative of ax^{n} is nax^{n-1}.
19r^{0}
Subtract 1 from 1.
19\times 1
For any term t except 0, t^{0}=1.
19
For any term t, t\times 1=t and 1t=t.
19r
Combine 6r and 13r to get 19r.
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