Differentiate w.r.t. a_1
9
Evaluate
9a_{1}
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\frac{\mathrm{d}}{\mathrm{d}a_{1}}(a_{1}\times 9)
Calculate the square root of 81 and get 9.
9a_{1}^{1-1}
The derivative of ax^{n} is nax^{n-1}.
9a_{1}^{0}
Subtract 1 from 1.
9\times 1
For any term t except 0, t^{0}=1.
9
For any term t, t\times 1=t and 1t=t.
a_{1}\times 9
Calculate the square root of 81 and get 9.
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