Not actually a HW question, but, is there a quick explanation that could show why:(adsbygoogle = window.adsbygoogle || []).push({});

[tex]\pi = 16\arctan(\frac{1}{5}) - 4\arctan(\frac{1}{239})[/tex]

I read that somewhere, and it turned out to be true, so I was just wondering how that came about...

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Why is pi = 16 arctan(1/5) - 4 arctan( 1/139)

**Physics Forums | Science Articles, Homework Help, Discussion**