Differentiate w.r.t. a
81
Evaluate
81a
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81a^{1-1}
The derivative of ax^{n} is nax^{n-1}.
81a^{0}
Subtract 1 from 1.
81\times 1
For any term t except 0, t^{0}=1.
81
For any term t, t\times 1=t and 1t=t.
Examples
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