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Differentiate w.r.t. a
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\frac{2^{1}a^{3}b^{6}}{5^{1}a^{9}b^{9}}
Use the rules of exponents to simplify the expression.
\frac{2^{1}}{5^{1}}a^{3-9}b^{6-9}
To divide powers of the same base, subtract the denominator's exponent from the numerator's exponent.
\frac{2^{1}}{5^{1}}a^{-6}b^{6-9}
Subtract 9 from 3.
\frac{2^{1}}{5^{1}}\times \frac{1}{a^{6}}b^{-3}
Subtract 9 from 6.
\frac{2}{5}\times \frac{1}{a^{6}}\times \frac{1}{b^{3}}
Divide 2 by 5.
\frac{\mathrm{d}}{\mathrm{d}a}(\frac{2b^{6}}{5b^{9}}a^{3-9})
To divide powers of the same base, subtract the denominator's exponent from the numerator's exponent.
\frac{\mathrm{d}}{\mathrm{d}a}(\frac{2}{5b^{3}}a^{-6})
Do the arithmetic.
-6\times \frac{2}{5b^{3}}a^{-6-1}
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}.
\left(-\frac{12}{5b^{3}}\right)a^{-7}
Do the arithmetic.