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作者 wxtab019 在 PTT [ Math ] 看板的留言(推文), 共281則
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2F→: 例如:本來19個10 1個0 後來19個10 1個20標準差不變01/31 22:55
1F→: y=ax+b a其實就是那條線的斜率=tanθ01/31 00:47
2F→: 用ax+by+c=0的話 就是上面寫的 -a/b01/31 00:48
3F→: 所以斜率就是tanθ=-4/3 上面寫的y/x01/31 00:51
4F→: 斜角定義=從x軸正向轉到直線L 所形成的角稱為直線L01/31 00:52
5F→: 的斜角01/31 00:52
6F→: 表示順時針逆時針都可以轉 所以一定θ<π01/31 00:53
7F→: 所以知道cosθ<0 sinθ>001/31 00:54
8F→: 所以cosθ=-3/5 sinθ=4/501/31 00:56
1F→: cos^2+sin^2=101/29 15:14
15F→: 你知道|axb|=|a||b|sinθ a‧b=|a||b|cosθ 是什麼?01/29 21:44
1F→: 沒有一分之二嗎01/25 22:47
1F→: 用期望值去看?01/25 19:33
6F→: a=001/18 09:47
7F→: 4和5的問題主要在 a<0的時候 m,n非整數會有問題01/18 09:59
8F→: 不過3 0^0 有些地方的確是定義成1就是了01/18 10:00
3F→: cos120度很難背嗎?01/06 13:28
4F→: 他上面說的<意思為角度120應該是指相位角吧 ∠12001/06 13:31
1F→: 就是因為乘進去才會變你下面看到的了11/30 22:44
2F→: 第一項變成s/(s+4) s->∞的時候 s/(s+4)->111/30 22:45
3F→: 也可以說 x->0時,x=sinx=tanx11/21 04:59