10/(sin(-33п/4)cos(21п/4))=
-10 -20 -20
----------------------------------- = ----------------------------- = ---------------------------------- =
sin(33п/4)cos(21п/4) sin(54п/4)+sin(12п/4) sin((24+3)п/2)+sin(2п+п)
-20 -20 -20
---------------------------- = ---------------- = ------- = 20
sin(12п+3п/2)+sinп sin(3п/2) -1