Calculus 10th Edition
Sum of the squares of the lengths of the vertical feeder lines is .
From the graph, equation of the trunk line is .
Consider .
Apply derivative on each side with respect to .
To minimizing sum function equate to zero.
Equation of the trunk line is .
Sum of the lengths of the feeder lines is .
Substitute in above expression.
Equation of the trunk line is .
Sum of the lengths of the feeder lines is .
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