1 ------ cos(x)
1/cos(x)
sin(x) ------- 2 cos (x)
2 2*sin (x) 1 + --------- 2 cos (x) ------------- cos(x)
/ 2 \ | 6*sin (x)| |5 + ---------|*sin(x) | 2 | \ cos (x) / ---------------------- 2 cos (x)