VMS Help RTL Routines, MTH$, MTH$xCOSD, Argument  *Conan The Librarian (sorry for the slow response - running on an old VAX)

 angle-in-degrees

    OpenVMS usage:floating_point
    type:         F_floating, D_floating, G_floating
    access:       read only
    mechanism:    by reference

    Angle (in degrees). The angle-in-degrees argument is the address
    of a floating-point number. For MTH$COSD, angle-in-degrees
    specifies an F-floating number. For MTH$DCOSD, angle-in-degrees
    specifies a D-floating number. For MTH$GCOSD, angle-in-degrees
    specifies a G-floating number.