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Evaluate
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Differentiate w.r.t. k
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-2k^{6}k^{3}
Divide -6k^{6} by 3 to get -2k^{6}.
-2k^{9}
To multiply powers of the same base, add their exponents. Add 6 and 3 to get 9.
\frac{\mathrm{d}}{\mathrm{d}k}(-2k^{6}k^{3})
Divide -6k^{6} by 3 to get -2k^{6}.
\frac{\mathrm{d}}{\mathrm{d}k}(-2k^{9})
To multiply powers of the same base, add their exponents. Add 6 and 3 to get 9.
9\left(-2\right)k^{9-1}
The derivative of ax^{n} is nax^{n-1}.
-18k^{9-1}
Multiply 9 times -2.
-18k^{8}
Subtract 1 from 9.