/ 9 9\ |d - - - c - -|*c*d \ d c/ 2 ------------------- - c 2 d
/ 9 9\ c*|d - c - - - -| 2 \ c d/ - c + ----------------- d
-c^2 + c*(d - c - 9.0/c - 9.0/d)/d
3 3 / / 2 \\ - c *d + c*d*\-9*d + c*\-9 + d - c*d// ---------------------------------------- 3 c*d
/ 2 \ 2 2 -9*d + c*\-9 + d - c*d/ - c *d -------------------------------- 2 d
2 2 9 c 9*c c - c - - - -- - --- d d 2 d
/ 2 2 2 2\ -\9*c + 9*d + d*c + c *d - c*d / ----------------------------------- 2 d
2 2 9*c + 9*d + d*c c - c - ---------------- 2 d