The function sinh(x) is known as the hyperbolic sine function, which is defined for all real numbers. It is calculated using the formula: sinh(x) = (e^x - e^(-x)) / 2, where e is the base of the natural logarithm, approximately equal to 2.71828. When we evaluate sinh(0), we substitute 0 into the formula. For sinh(0), the calculation becomes: sinh(0) = (e^0 - e^0) / 2 = (1 - 1) / 2 = 0. Therefore, the value of sinh(0) is 0. This means that at the point where x equals 0, the hyperbolic sine function crosses the horizontal axis, similar to the regular sine function.