Differentiate w.r.t. r
-6
Evaluate
-6r
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\frac{\mathrm{d}}{\mathrm{d}r}(-6r)
Add -7 and 7 to get 0.
-6r^{1-1}
The derivative of ax^{n} is nax^{n-1}.
-6r^{0}
Subtract 1 from 1.
-6
For any term t except 0, t^{0}=1.
-6r
Add -7 and 7 to get 0.
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Limits
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