※ 引述《pilifall (玄字流)》之銘言:
: 請教高手指點,感謝
: http://i.imgur.com/8tzKzNW.jpg
h(-x) = -h(x)
a
∫ h(x)ln[1 + exp(bx)]dx
-a
0 a
= ∫h(x)ln[1 + exp(bx)]dx + ∫h(x)ln[1 + exp(bx)]dx
-a 0
= I_1 + I_2
a
I_1 = ∫h(-u)ln[1 + exp(-bu)]du
0
a a
= -∫h(x)ln[1 + exp(bx)]dx + ∫h(x)bx dx
0 0
a
= -I_2 + b∫h(x)xdx
0
所以
a
∫ h(x)ln[1 + exp(bx)]dx
-a
a
= b∫h(x)xdx
0
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