Differentiate w.r.t. x
\frac{1}{21} = 0.047619047619047616
Evaluate
\frac{x}{21}
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\frac{1}{21}x^{1-1}
The derivative of ax^{n} is nax^{n-1}.
\frac{1}{21}x^{0}
Subtract 1 from 1.
\frac{1}{21}\times 1
For any term t except 0, t^{0}=1.
\frac{1}{21}
For any term t, t\times 1=t and 1t=t.
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