Differentiate w.r.t. θ_a
\frac{3}{25} = 0.12
Evaluate
\frac{3\theta _{a}}{25}
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\frac{3}{25}\theta _{a}^{1-1}
The derivative of ax^{n} is nax^{n-1}.
\frac{3}{25}\theta _{a}^{0}
Subtract 1 from 1.
\frac{3}{25}\times 1
For any term t except 0, t^{0}=1.
\frac{3}{25}
For any term t, t\times 1=t and 1t=t.
\theta _{a}\times \frac{3}{25}
Reduce the fraction \frac{12}{100} to lowest terms by extracting and canceling out 4.
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