[數撚圍爐區] What is Mathematics? (4)

吾不會數學 2018-11-29 03:05:34 unique?

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icic 2018-11-29 03:08:36 probably not

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笑騎騎•放毒蛇 2018-11-29 03:54:18

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吾不會數學 2018-11-29 09:51:06 岩岩發現龜仔未係過呢度留言

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可惜他有男朋友 2018-11-29 09:52:00 啲theorem 成日用induction,但我完全sense 唔到可以用MI

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四條煙、 2018-11-29 13:03:24 成日做到一半就寫 we will proceed by induction and since it will be obvious from here onwards we will omit the nuisance steps QED

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吾不會數學 2018-11-29 13:38:43 通常見到D for all n, 又似乎有D recursion(?) 就試下用MI

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吾不會數學 2018-11-29 13:39:18 有D MI狠毒係base case最難證

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吾不會數學 2018-11-29 13:44:21

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夢追人 2018-11-29 13:50:27

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吾不會數學 2018-11-29 13:53:05

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鬆弛熊神 2018-11-29 14:41:24 use implicit differentiation to find an equation of the tangent line to hyperbola x^2/6 - y^2/8=1 at x=3
唔識做

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吾不會數學 2018-11-29 14:51:01 assume y is a function of x

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高山一実 2018-11-29 14:55:52 有2條tangent lines at x=3, 點解會寫the tangent line

鬆弛熊神 2018-11-29 14:59:47 我點知

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吾不會數學 2018-11-29 15:01:27 calculus d 人本身都寫得鳩鳩地架啦
會寫find the parametrisation of blah blah blah, 但明明有無限種parametrisation

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d set ge 符號又亂鳩咁寫

鬆弛熊神 2018-11-29 15:01:59 我上網睇example係d左舊(x^2/6) - (y^2/8) 再sub返個x落去
但我跟住做完出嚟完全唔覺得係岩

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而且根本唔知自己做緊乜
有冇巴打救下我

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好趕

日向葵海（主唱） 2018-11-29 15:13:30 Post 上嚟睇下做成點

可惜他有男朋友 2018-11-29 15:21:07 當年份功課要證Every tree has a centre consisting of either one vertex or two adjacent vertices.

完全無方向，睇solution 見佢用MI

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吾不會數學 2018-11-29 15:27:42 走投無路試下MI無壞

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吾不會數學 2018-11-29 15:31:09

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岩土痴sin佬 2018-11-29 15:36:44

use implicit differentiation to find an equation of the tangent line to hyperbola x^2/6 - y^2/8=1 at x=3
唔識做
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assume y is a function of x
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我上網睇example係d左舊(x^2/6) - (y^2/8) 再sub返個x落去
但我跟住做完出嚟完全唔覺得係岩
:^(
而且根本唔知自己做緊乜
有冇巴打救下我
:^(
好趕

(1/6)2x-(1/8)(2y•dy/dx)=0

dy/dx=(x/3) / (y/4)

Since x=3, (1/8)y^2= 3^2/6-1 = 1/2
y= 2 or -2

Then find dy/dx at (3,2) and (3,-2)

Use point-slope form to find equation of st.line

四條煙、 2018-11-29 15:38:31 遇到過

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ピピ美(大塚芳忠) 2018-11-29 20:11:57

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ピピ美(大塚芳忠) 2018-11-29 20:12:36

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