Differentiate w.r.t. x_2
160
Evaluate
160x_{2}
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160x_{2}^{1-1}
The derivative of ax^{n} is nax^{n-1}.
160x_{2}^{0}
Subtract 1 from 1.
160\times 1
For any term t except 0, t^{0}=1.
160
For any term t, t\times 1=t and 1t=t.
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