What is BESSELJ function in Excel? BESSELJ function is one of Engineering functions in Microsoft Excel that returns the Bessel function. Syntax of BESSELJ function BESSELJ(X, N) The BESSELJ function syntax has the following arguments: X: The value at which to evaluate the function. N: The order of the Bessel function. If n is not an integer, it is truncated. BESSELJ…