/ 2 2 2 2 2 \
| 3*cos(x) 6*cos (x)*atan(cos(x)) 2*sin (x)*atan(cos(x)) 6*sin (x)*cos(x) 8*cos (x)*sin (x)*atan(cos(x)) |
2*|----------- - ---------------------- + ---------------------- + ---------------- - ------------------------------ + atan(cos(x))|*sin(x)
| 2 2 2 2 2 |
|1 + cos (x) 1 + cos (x) 1 + cos (x) / 2 \ / 2 \ |
\ \1 + cos (x)/ \1 + cos (x)/ /
-------------------------------------------------------------------------------------------------------------------------------------------
2
1 + cos (x)