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

    MTH$SINCOSD, MTH$DSINCOSD, MTH$GSINCOSD, and MTH$HSINCOSD return
    the sine and cosine of the input angle by reference in the sine
    and cosine arguments.