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Differentiate w.r.t. b
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\frac{\mathrm{d}}{\mathrm{d}b}(\frac{5}{az}b^{3-1})
To divide powers of the same base, subtract the denominator's exponent from the numerator's exponent.
\frac{\mathrm{d}}{\mathrm{d}b}(\frac{5}{az}b^{2})
Do the arithmetic.
2\times \frac{5}{az}b^{2-1}
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}.
\frac{10}{az}b^{1}
Do the arithmetic.
\frac{10}{az}b
For any term t, t^{1}=t.
\frac{5b^{2}}{az}
Cancel out b in both numerator and denominator.