cos(pi)*cos(pi) sin(pi)*sin(pi)
--------------- - ---------------
7*42 7*42
cos(pi)*cos(pi)/(7*42) - sin(pi)*sin(pi)/(7*42)
1/294
2 2
sin (pi) cos (pi)
- -------- + --------
294 294
-sin(pi)^2/294 + cos(pi)^2/294
2 2
sin (pi) cos (pi)
- -------- + --------
294 294
-sin(pi)^2/294 + cos(pi)^2/294