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4A) Determine the integral x /(square root of x^2+4) dx by u substitution.

4B) Determine the integral dx /(square root of x^2+4)

4C) Determine the integral dx / x^2+4

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Integrals are found.

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4A) Determine the integral x /(square root of x^2+4) dx by u substitution.

Let u = x^2

2x.dx = du

I will use "I" for the Integral sign.

Then, I [ x /(square root of x^2+4) ]

= (1/2) * I [ du/(square root of u+4) ]

= (1/2) * (square root of u+4) / (1/2) = (square root of ...

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