Hi, I was just looking at an example for a certain problem and noticed that in the second step they went to arctan(epsilon). I know there's a form that is equal to arctan but am a little unsure.(adsbygoogle = window.adsbygoogle || []).push({});

I've come across formulas on the web such as

arctan(x) = ∫(dt)/(a^{2}+t^{2})

but nothing else that would get to arctan.

Can somebody please direct me to the correct formula?

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# I Equivalent form for arctan?

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