cexp() returns the exponential of a complex number.

    cexp(x,y) is defined as e**(x + iy) = e**x cos y + ie**x sin y.

                           Entry-Point Names

    Generic
    Function   Data Type   OpenVMS        Tru64 UNIX
    Name       Required

    cexp       S_FLOAT     math$cexp_s    cexpf
               T_FLOAT     math$cexp_t    cexp
               X_FLOAT     math$cexp_x    cexpl
               F_FLOAT     math$cexp_f
               G_FLOAT     math$cexp_g