Differentiate w.r.t. l
-\frac{1}{2} = -0.5
Evaluate
-\frac{l}{2}
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\frac{\mathrm{d}}{\mathrm{d}l}(-\frac{1}{2}l)
Combine -\frac{l}{4} and -\frac{l}{4} to get -\frac{1}{2}l.
-\frac{1}{2}l^{1-1}
The derivative of ax^{n} is nax^{n-1}.
-\frac{1}{2}l^{0}
Subtract 1 from 1.
-\frac{1}{2}
For any term t except 0, t^{0}=1.
-\frac{1}{2}l
Combine -\frac{l}{4} and -\frac{l}{4} to get -\frac{1}{2}l.
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