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Numerical substitution of high number limit problem
Substitution principle: ①. The trend limit of all variables should be substituted at the same time, and it is not allowed to substitute a part of the trend limit before using it.

The limit of as the basis of the next operation, and then take the limit; ② As long as there is no infinitive in the following forms after replacement:

0/0; ∞/∞; 1^∞; ∞^0; ∞-∞; 0^0; 0? ∞; When you encounter these infinitives, you need to do some processing before you can substitute them.

If it is 0/0 or ∞ /∞, it can be handled by L'H?pital's law.

In your operation, because ln 1=0, you will have 0/0 after you substitute it. Please note that all x's on the numerator denominator should be replaced by 0.

It is infinitive, which means it can't be replaced yet.