Understanding the Integration of 1/(x^2+d^2)^1/2: A Step-by-Step Explanation

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SUMMARY

The integral of 1/(x^2+d^2)^(1/2) with respect to dx can be solved using the substitution x = d.tan(u). This method simplifies the integral, leading to the result ln { x + (x^2 + d^2)^(1/2) }. The discussion highlights the importance of choosing appropriate constants for differentiation to avoid confusion, suggesting alternatives like 'a' or 's' instead of 'd'. The step-by-step explanation clarifies the integration process and the rationale behind the substitution.

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Homework Statement




To find the INTEGRAL of 1/(x^2+d^2)^1/2 integrated with respect to dx.
d is a constant

I tried to write it as :

ln (x^2+ d^2)^1/2

but my book gives an answer of

ln { x + (x^2+ d^2)^1/2 }

i don't understand how. Can you please explain it step by step. Clearly please.
 
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how about starting with the subtitution x = d.sec(u)?
 
Even better, use the substitution:

<br /> x=d\sinh u<br />
 
Last edited:
actually i meant x = d.tan(u), which makes more sense... but i'd still try huntmat's suggestion
 
also d is a bad constant to use when you're differentiating as you may get confused, something like a or s would be better
 

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