sqrt(a^2 + b^2) = a sqrt(1 + (b/a)^2) whose first order taylor series approximation is a(1 + 1⁄2 b/a) = a + 1⁄2 b
isn’t the first order approximation a(1 + 1⁄2 b^2/a^2)?
isn’t the first order approximation a(1 + 1⁄2 b^2/a^2)?