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## Main Question or Discussion Point

There exist such a formula for large x:

[tex]\arctan(x)\approx \pi/2-1/x+1/3x^3...[/tex]

I can't understand how it is derived. I tried to get it from Taylor series (for x -> infinity) and understood that here is something different. Can someone help me?

Thank you

[tex]\arctan(x)\approx \pi/2-1/x+1/3x^3...[/tex]

I can't understand how it is derived. I tried to get it from Taylor series (for x -> infinity) and understood that here is something different. Can someone help me?

Thank you