1:- module(si, [sin/1, cos/1, tan/1, asin/1, acos/1, atan/1, atan2/1]).    2:- reexport(si/symbols).    3
    4:- use_module(si/constants).    5:- use_module(si/prefixes).    6:- use_module(si/units).    7:- use_module(si/symbols).    8
    9sin(si:radian).
   10cos(si:radian).
   11tan(si:radian).
   12asin(si:radian).
   13acos(si:radian).
   14atan(si:radian).
   15atan2(si:radian)