________ / 2 /x\ x*\/ 9 - x + 9*asin|-| \3/
x*sqrt(9 - x^2) + 9*asin(x/3)
________ 2 / 2 3 x \/ 9 - x + ------------- - ----------- ________ ________ / 2 / 2 / x \/ 9 - x / 1 - -- \/ 9
/ 2 \ | 3 1 x | x*|- ----------- + ------------- - -----------| | ________ 3/2 3/2| | / 2 / 2\ / 2\ | | \/ 9 - x | x | \9 - x / | | 3*|1 - --| | \ \ 9 / /
2 4 2 3 1 6*x 3*x x - ----------- + ------------- - ----------- - ----------- + ------------- ________ 3/2 3/2 5/2 5/2 / 2 / 2\ / 2\ / 2\ / 2\ \/ 9 - x | x | \9 - x / \9 - x / | x | 3*|1 - --| 9*|1 - --| \ 9 / \ 9 /