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.