-1 ------------------ ____ _______ 2*\/ -x *\/ x + 1
1 1 - + ----- x 1 + x ------------------ ____ _______ 4*\/ -x *\/ 1 + x
/3 3 2 \ -|-- + -------- + ---------| | 2 2 x*(1 + x)| \x (1 + x) / ----------------------------- ____ _______ 8*\/ -x *\/ 1 + x