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Differentiate w.r.t. r
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\frac{\mathrm{d}}{\mathrm{d}r}(12r+8+3r^{4})
Add 3 and 5 to get 8.
12r^{1-1}+4\times 3r^{4-1}
The derivative of a polynomial is the sum of the derivatives of its terms. The derivative of a constant term is 0. The derivative of ax^{n} is nax^{n-1}.
12r^{0}+4\times 3r^{4-1}
Subtract 1 from 1.
12r^{0}+12r^{4-1}
Multiply 4 times 3.
12r^{0}+12r^{3}
Subtract 1 from 4.
12\times 1+12r^{3}
For any term t except 0, t^{0}=1.
12+12r^{3}
For any term t, t\times 1=t and 1t=t.
12r+8+3r^{4}
Add 3 and 5 to get 8.