Integral Calculus - Trigonometric Substitution

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SUMMARY

The forum discussion focuses on solving the integral ∫ dx / (x+1)√[2x(x+2)] using trigonometric substitution. The user proposes the substitution x = tan θ to simplify the integral, while also transforming the expression into a more manageable form. The discussion highlights the importance of rewriting the integral in terms of √x to facilitate the application of trigonometric identities. The user seeks confirmation on the validity of their approach and whether they can proceed with the tangent substitution method.

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Myung
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Homework Statement


2
∫ dx / (x+1)√[2x(x+2)]
1

Homework Equations



Let x = tan θ if √(a^2 + x^2)
Where a = constant

The Attempt at a Solution



2
∫ dx / (x+1)√(2x)√(x+2)
1

2
1/√2 ( ∫ dx / (√x)(x+1)[√(x+2)]
1

Now make all x in terms of √x so we can apply relevant equation ( applied also to constant )

2
1/√2 ( ∫ dx / (√x)((√x)^2+1)[√(√x+2)]
1

Now before i go on I want to ask if this is possible so I can apply the rule of the tangent in substitution?
 
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how about noticing that
[tex]2x(x+2) = 2(x^2+2x) =2(x^2+2x+1-1) = 2((x+1)^2-1)[/tex]
 

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