Differentiate w.r.t. a
\frac{2a}{25}
Evaluate
\frac{a^{2}}{25}
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2\times \frac{1}{25}a^{2-1}
The derivative of ax^{n} is nax^{n-1}.
\frac{2}{25}a^{2-1}
Multiply 2 times \frac{1}{25}.
\frac{2}{25}a^{1}
Subtract 1 from 2.
\frac{2}{25}a
For any term t, t^{1}=t.
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