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Evaluate
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Differentiate w.r.t. a
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3a+9a
Combine a and 2a to get 3a.
12a
Combine 3a and 9a to get 12a.
\frac{\mathrm{d}}{\mathrm{d}a}(3a+9a)
Combine a and 2a to get 3a.
\frac{\mathrm{d}}{\mathrm{d}a}(12a)
Combine 3a and 9a to get 12a.
12a^{1-1}
The derivative of ax^{n} is nax^{n-1}.
12a^{0}
Subtract 1 from 1.
12\times 1
For any term t except 0, t^{0}=1.
12
For any term t, t\times 1=t and 1t=t.