acos(2*x + 3)
-2 ------------------- ________________ / 2 \/ 1 - (2*x + 3)
-4*(3 + 2*x) ------------------- 3/2 / 2\ \1 - (3 + 2*x) /
/ 2 \ | 3*(3 + 2*x) | -8*|1 + --------------| | 2| \ 1 - (3 + 2*x) / ----------------------- 3/2 / 2\ \1 - (3 + 2*x) /