Final answer:
Without the specific integral from the student, we can only explain that finding an indefinite integral typically involves identifying a substitution, simplifying, and integrating, then switching back to the original variable. This method is also applicable in physics for potential calculations involving point charges and charge density functions.
Step-by-step explanation:
The student's question seems to be asking for assistance in finding the indefinite integral using the method of substitution. However, the provided question contains some typos, and without the actual integral to work with, we cannot provide a specific answer. That said, the general method involves identifying a part of the integrand that can be substituted with a new variable, simplifying the integral, performing the integral, and then substituting back to the original variable.
Once the portion to substitute is identified (we'll call this 'u'), we find the differential of 'u' (du) and replace the corresponding parts of the original integral with u and du. After integrating with respect to u, we substitute back the original variable to get the indefinite integral.
This concept is generalized in physics for integrating electric potential, where the expression for the field of a point charge plays a significant role. Accurate expressions for dl, dA, or dV in terms of r are crucial, along with the correct representation of charge density function, whether constant or location-dependent.