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作者 birdhackor 在 PTT [ Math ] 看板的留言(推文), 共3則
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[微積] Cos[Cos[Cos...[Cos[x]...]]]]=?
[ Math ]26 留言, 推噓總分: +7
作者: harry901 - 發表於 2011/12/18 01:38(14年前)
24F→birdhackor:不等式不能-1<=k<=1 取Cos吧 k取0的話 cosk=112/18 04:32
25F→birdhackor:所以第二步應該是 0.54<=cosk<=112/18 04:33
26F→birdhackor:接下來範圍會不斷震盪~逼近0.7312/18 04:47
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