0.321428571428571
// 7*pi*I 7*pi*I 7*pi*I \ || ------ ------ ------ | / || 3 ________ 3 3 ________ 3 2 3 ________ 3 | | || 9*\/ -1 + x *e 3*x*\/ -1 + x *e 3*x *\/ -1 + x *e | | 3 _______ ||- -------------------- - ---------------------- + ----------------------- for |x| > 1| | x*\/ 1 - x dx = C + |< 28 28 7 | | || | / || 3 _______ 3 _______ 2 3 _______ | || 9*\/ 1 - x 3*x*\/ 1 - x 3*x *\/ 1 - x | || - ----------- - ------------- + -------------- otherwise | \\ 28 28 7 /