### Step 6: Solve the integral by trig substitution

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Looking at the integrand, you may now realize that trig substitution is required.
All that means is that we should have integrated over the angle variable theta rather than the linear variable *x*.
The figure below shows the relationship between the two variables for the quantities involved.

"http://www.physics.udel.edu/~watson/phys208/lineofcharge/lineofcharge6.html"

Last updated Sept. 25, 1997.

Copyright George Watson, Univ. of Delaware, 1997.