Hello there.(adsbygoogle = window.adsbygoogle || []).push({});

Can you please explain the following:

Let us suppose that δ is very much less than r, and expand |r+δ|^-1 in powers of δ/r. Keeping the lower order terms gives:

|r+δ|^-1 ≈ 1/r.(1-r.δ/r^2) + 1/2r [3(δ.r/r)^2-(δ/r)^2]

How did they reach here? is this kind of a mathematical formula that i dont know about?

Thanks in advance

**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!

# Some kind of mathematical formula that I obviously dont know about?

Loading...

Similar Threads for kind mathematical formula |
---|

I Geometric intuition of a rank formula |

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