19/12/10 14:34:09.51 9+9M8wAb.net
b = log(3) = 1 + log(3/e) ≒ 3/e,
A (1, 0)
P (cosh(1/e), sinh(1/e)) = (1.06843424428 0.3762336167)
Q (cosh(2/e), sinh(2/e)) = (1.2831034687 0.8039617599)
B (5/3, 4/3) = (1.6666666667 1.3333333333)
とおくと
S(A,P) = S(P,Q) = 0.0041770878
S(Q,B) = 0.0040074760
∴ S = 0.0123616516 > 0.012360077