/ ________\ ________ | / 2 | / 2 |\/ x - 9 | \/ x - 9 - 3*atan|-----------| \ 3 /
sqrt(x^2 - 9) - 3*atan(sqrt(x^2 - 9)/3)
x 9 ----------- - ------------- ________ ________ / 2 / 2 \/ x - 9 x*\/ x - 9
2 9 9 x 1 + -- + ------- - ------- 2 2 2 x -9 + x -9 + x -------------------------- _________ / 2 \/ -9 + x
/ 3 \ | 6 x x 9*x 3 | 3*|- -- + ---------- - ------- - ---------- - -----------| | 3 2 2 2 / 2\| | x / 2\ -9 + x / 2\ x*\-9 + x /| \ \-9 + x / \-9 + x / / ---------------------------------------------------------- _________ / 2 \/ -9 + x