Differentiate w.r.t. g
Evaluate

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3g^{1-1}
The derivative of ax^{n} is nax^{n-1}.
3g^{0}
Subtract 1 from 1.
3\times 1
For any term t except 0, t^{0}=1.
3
For any term t, t\times 1=t and 1t=t.
g\times 3
Calculate g to the power of 1 and get g.