Differentiate w.r.t. x_22
\pi
Evaluate
\pi x_{22}
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\frac{\mathrm{d}}{\mathrm{d}x_{22}}(x_{22}\pi )
Cancel out 5 and 5.
\pi x_{22}^{1-1}
The derivative of ax^{n} is nax^{n-1}.
\pi x_{22}^{0}
Subtract 1 from 1.
\pi \times 1
For any term t except 0, t^{0}=1.
\pi
For any term t, t\times 1=t and 1t=t.
x_{22}\pi
Cancel out 5 and 5.
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