Differentiate w.r.t. x_80
20
Evaluate
20x_{80}
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\frac{\mathrm{d}}{\mathrm{d}x_{80}}(20x_{80})
Divide 400x_{80} by 20 to get 20x_{80}.
20x_{80}^{1-1}
The derivative of ax^{n} is nax^{n-1}.
20x_{80}^{0}
Subtract 1 from 1.
20\times 1
For any term t except 0, t^{0}=1.
20
For any term t, t\times 1=t and 1t=t.
20x_{80}
Divide 400x_{80} by 20 to get 20x_{80}.
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