Please think if we use "y = (exp(x) - exp(-x)) / (exp(x) + exp(-x))", what might happen when x has a large absolute value

When x has a large absolute value, the terms exp(x) and exp(-x) become very large and very small, respectively. This can cause numerical overflow or underflow issues when calculating the numerator and denominator of the expression y. In addition, the denominator will approach 1 and the numerator will approach a very large positive or negative value, depending on the sign of x. As a result, the value of y may become very large or very small, and may be difficult to represent accurately using standard floating-point arithmetic.