Differentiate w.r.t. r
199
Evaluate
199r
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199r^{1-1}
The derivative of ax^{n} is nax^{n-1}.
199r^{0}
Subtract 1 from 1.
199\times 1
For any term t except 0, t^{0}=1.
199
For any term t, t\times 1=t and 1t=t.
r\times 199
Anything divided by one gives itself.
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