Definition of arcsin function: The arcsin function, also known as the inverse sine function, is defined only for inputs between −1 and 1, inclusive. This is because the sine function, which arcsin is the inverse of, has outputs that range from −1 to 1.
Range of sine function: Since the arcsin function is the inverse of the sine function, we need to consider the range of angles for which the sine function gives all possible values between −1 and 1. The sine function achieves all values between −1 and 1 in the interval from −2π to 2π radians.
Range of arcsin function: Therefore, the range of the arcsin function is the set of all real numbers from −2π to 2π, including these endpoints. This is because for every value y in the interval [−1,1], there is a corresponding angle x in the interval [−2π,2π] such that sin(x)=y.