※ 引述《XrGodz (G_z*)》之銘言：
: ln x x x df(x)
: If f(x) = e + e + ln(e ) , then ──── = ?
: dx
f(x) = x + e^x + x
df(x)/dx = 1 + e^x + 1 = 2 + e^x
: d S+1
: ── S = ?
: dS
d{e^[(s+1)lns]}/ds =
(s+1)ln(s) = (s)ln(s)+ln(x)
.....
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