When x-> 0, both the numerator and denominator are one > 0, which is an indefinite form of 0/0, which conforms to the conditions of Robida's law. Derive and sort the numerator and denominator respectively, substitute x = 0, and find the limit of the fractional function as 1.

The concept of equivalent infinitesimal can also be applied to this topic. When x >, the molecule LN (1+X) ~ X and the denominator E X- 1 ~ X are replaced by equivalent infinitesimal, and the limit of the original fractional function is equal to the limit of X/X = 1. According to this constant,