Differentiate w.r.t. a
42a
Evaluate
21a^{2}
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2\times 21a^{2-1}
The derivative of ax^{n} is nax^{n-1}.
42a^{2-1}
Multiply 2 times 21.
42a^{1}
Subtract 1 from 2.
42a
For any term t, t^{1}=t.
Examples
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