作者查詢 / oaoa0123
作者 oaoa0123 在 PTT [ Math ] 看板的留言(推文), 共120則
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5F→: 其實這題用公式解數字並不醜04/24 06:22
29F推: 若以幾何意義來說,dy/dx就是delta(y)/delta(x)的04/20 20:55
30F→: 極限版本而已。另一方面,可以把d/dx當成一個operat04/20 20:55
31F→: or,這個符號的功用是把東西微分。04/20 20:55
32F推: 同樣的道理,∫fdx就是sigma(f*delta(x))的極限。從04/20 21:02
33F→: 把∫dx當成operator的角度來說,這個符號的功用是04/20 21:02
34F→: 把東西積分。04/20 21:02
4F推: 可見得非選不會考這種題目 :P04/10 15:18
4F推: sin只在+-1間變動,極限跟著x項趨近於003/25 18:40
2F推: 解答的sin^2項用半角公式展開就是你的答案03/25 10:01
10F推: 台北酷課雲呢?02/07 20:11
1F推: 你的正負號設錯了 u=x+7/3 v=y-8/3 才對02/02 15:06
13F推: 因為i是x^2+1=0的解,所以x^2+2=0的解就是sqrt(2)i01/12 14:42
14F→: 以上的示例保證了負數根號內的正數可被提出01/12 14:47
186F推: i是x^2+1=0的一個解01/12 21:49
187F→: 為什麼sqrt(2)i是x^2+2=0的解?01/12 21:49
188F→: 因為(sqrt(2)i)^2+2=2i^2+2=2(i^2+1)=001/12 21:49
189F→: 其中我們也用了定義出的四則運算01/12 21:49
1F→: 你就計算錯誤而已 拿個計算機對答案就好了01/09 03:05