Hello,
I have a problem to understand how the author made the following expansion:
1/sqrt{1+[2(r-r')*d]/(r-r')^2}≈1-{[(r-r')*d]/(r-r')^2+....}
where all the letters go for vectors and the symbol '*' is the dot product.
I suppose it is a Taylor expansion, but i just don't get it in this case.
Can someone give me the way?
I have a problem to understand how the author made the following expansion:
1/sqrt{1+[2(r-r')*d]/(r-r')^2}≈1-{[(r-r')*d]/(r-r')^2+....}
where all the letters go for vectors and the symbol '*' is the dot product.
I suppose it is a Taylor expansion, but i just don't get it in this case.
Can someone give me the way?