Differentiate w.r.t. x
\frac{20x^{19}}{3}
Evaluate
\frac{x^{20}}{3}
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20\times \frac{1}{3}x^{20-1}
The derivative of ax^{n} is nax^{n-1}.
\frac{20}{3}x^{20-1}
Multiply 20 times \frac{1}{3}.
\frac{20}{3}x^{19}
Subtract 1 from 20.
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