- #1
Char. Limit
Gold Member
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Why is arc length of a function [tex]f(x)[/tex] from a to b defined as [tex]\int_a^b \sqrt{1+(f'(x))^2} dx[/tex]?
Where they get the idea of squaring the derivative, adding 1, taking the square root, and then integrating it is beyond me.
Where they get the idea of squaring the derivative, adding 1, taking the square root, and then integrating it is beyond me.