Differentiate w.r.t. λ
\frac{1}{2\sqrt{\lambda }}
Evaluate
\sqrt{\lambda }
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\frac{1}{2}\lambda ^{\frac{1}{2}-1}
The derivative of ax^{n} is nax^{n-1}.
\frac{1}{2}\lambda ^{-\frac{1}{2}}
Subtract 1 from \frac{1}{2}.
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