Just wondering if anybody might be able to guide me through this problem, I'm not really sure where to start.
I wish to show that when y<<1,
τ + c ≈ [2y^(2/3)]/3 where c is a constant.
I already know the results
√(1+y) = 1+y/2 - (y^2)/8 + ....
ln[√(y)+√(1+y)] = ln[1 + √(y) + y/2 -(y^2)/8 + ....]