When x tends to zero.

E x-e x and x both tend to 0, so the numerator and denominator are differentiated respectively.

It becomes (e x+e-x)/ 1

When x tends to 0, it is 2.

2 On the question of grading

If the method is wrong, there is no answer, obviously there is no score.

The method is right. If there is no answer, there should be a score.

Obviously, the method is king.