#page 850
x0,x1,f0,f1,x2=9.0,9.5,ln(9.0),ln(9.5),9.2
l0(9.2)=(x2-x1)/(x0-x1)
l0(9.2)
l1(9.2)=(x2-x0)/(x1-x0)
l1(9.2)
p1(9.2)=(l0(9.2)*f0)+(l1(9.2)*f1)
p1(9.2)
e=2.2192-2.2188
e