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Evaluate
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Differentiate w.r.t. r
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0+9r
Zero divided by any non-zero term gives zero.
9r
Anything plus zero gives itself.
\frac{\mathrm{d}}{\mathrm{d}r}(0+9r)
Zero divided by any non-zero term gives zero.
\frac{\mathrm{d}}{\mathrm{d}r}(9r)
Anything plus zero gives itself.
9r^{1-1}
The derivative of ax^{n} is nax^{n-1}.
9r^{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.