MATH FUN

Now it is fun after 4 days of gnashing teeth. CRC integral tables clearly say, in 2 or 3 instances, how to solve the integral:    ∫dx (a+x^2)^-2  .   The solution looks like integration by parts but it is not. What’n’ell is it, it does work !!!  I am glad to learn this, wouldn’t you know it, this is the form DKS energy integration reduces to.

 

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