/ 10*x \ | e | 5*x 25*|1 + ---------|*e | 10*x| \ 1 - e / ----------------------- ___________ / 10*x \/ 1 - e
/ 20*x 10*x \ | 3*e 4*e | 5*x 125*|1 + ------------ + ---------|*e | 2 10*x| | / 10*x\ 1 - e | \ \1 - e / / --------------------------------------- ___________ / 10*x \/ 1 - e