How would you solve this

integral of dx/(1+4x^2)

I know arctan is 1+x^2, but dont see how to solve this to make it look like arctan. thanks.

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- August 9th 2007, 01:24 PM #1

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- August 9th 2007, 01:44 PM #2

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- August 9th 2007, 03:47 PM #3

- August 9th 2007, 07:06 PM #4

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