香港寵物小精靈村落 論壇

標題: A. Maths. Trigonometry Question [打印本頁]
作者: oscar    時間: 6/1/2005 07:07 PM
標題: A. Maths. Trigonometry Question
1)               1-sec(90-A)-cot(360-A)           cot A
Prove that -------------------------------------- = --------------- .
                1+sec(270+A)+cot(180-A)     1+cosec A
作者: oscar    時間: 7/1/2005 12:52 PM
有無人答到我呢題數？
作者: 細薯    時間: 7/1/2005 08:38 PM
i don't know.....
作者: oscar    時間: 7/1/2005 08:56 PM
那麼我的題目真的很難嗎？
作者: orb    時間: 7/1/2005 09:16 PM
高難度
作者: oscar    時間: 7/1/2005 09:20 PM
只是中四的Level2問題...並不是past paper問題來的...
作者: 水龍蜥    時間: 7/1/2005 09:22 PM
Originally posted by oscar at 2005-1-7 09:20 PM:
只是中四的Level2問題...並不是past paper問題來的...

你都識講中四la,我地先得f1,f2
作者: oscar    時間: 7/1/2005 09:24 PM
Originally posted by 水龍蜥 at 2005-1-7 21:22:

你都識講中四la,我地先得f1,f2


有人係中四ga ma...
今次落雷唔識？
作者: 水龍蜥    時間: 7/1/2005 09:26 PM
Originally posted by oscar at 2005-1-7 09:24 PM:


有人係中四ga ma...
今次落雷唔識？

落雷都冇上,佢知答你?
作者: oscar    時間: 7/1/2005 09:27 PM
Originally posted by 水龍蜥 at 2005-1-7 21:26:

落雷都冇上,佢知答你?


我尋日見到佢有睇呢個post...
作者: 水龍蜥    時間: 7/1/2005 09:29 PM
Originally posted by oscar at 2005-1-7 09:27 PM:


我尋日見到佢有睇呢個post...

o.......係咩,可能佢都唔識掛
作者: oscar    時間: 7/1/2005 09:32 PM
Originally posted by 水龍蜥 at 2005-1-7 21:29:

o.......係咩,可能佢都唔識掛


但係佢連微積分都識，我唔信trigo佢唔識...
作者: 水龍蜥    時間: 7/1/2005 09:36 PM
Originally posted by oscar at 2005-1-7 09:32 PM:


但係佢連微積分都識，我唔信trigo佢唔識...

係咩,不過同我講都冇用,我都唔知咩係連微積分[E-TeH]
作者: oscar    時間: 7/1/2005 09:37 PM
Originally posted by 水龍蜥 at 2005-1-7 21:36:

係咩,不過同我講都冇用,我都唔知咩係連微積分[E-TeH]


唉...總之佢學既野已超越佢本身既級數~
作者: 細薯    時間: 7/1/2005 09:38 PM
我G.Math. just finish teaching  "log"
準備teach trigonometry
but A.Math. not yet

Originally posted by oscar at 2005-1-7 09:37 PM:


唉...總之佢學既野已超越佢本身既級數~

你都係la~~XD
作者: 水龍蜥    時間: 7/1/2005 09:40 PM
Originally posted by oscar at 2005-1-7 09:37 PM:


唉...總之佢學既野已超越佢本身既級數~

佢讀中幾嫁?
作者: 細薯    時間: 7/1/2005 09:41 PM
Originally posted by 水龍蜥 at 2005-1-7 09:40 PM:

佢讀中幾嫁?

form 4

hey~~he is now at this region~~~~~
作者: 抹茶可樂    時間: 7/1/2005 09:41 PM
今日份a.maths卷出現相似題目…好彩響試場好快就諗到了- -"

LHS=(1-cscA+cotA)/(1+cscA-cotA)

(1-cscA+cotA)(1+cscA)
=1-cscA+cotA+cscA-cscAcscA+cscAcotA
=1-cscAcscA-cscA+cscA+cotA+cscAcotA
=-cotAcotA+cotA+cscAcotA
=cotA(1+cscA-cotA)

(1-cscA+cotA)(1+cscA)=cotA(1+cscA-cotA)
(1-cscA+cotA)/(1+cscA-cotA)=cotA/(1+cscA)

LHS=RHS
作者: oscar    時間: 7/1/2005 09:42 PM
Originally posted by smallpotato226 at 2005-1-7 21:38:
我G.Math. just finish teaching  "log"
準備teach trigonometry
but A.Math. not yet


你都係la~~XD

其實以前中三已經教左log，不過而家既syllabus改曬，越改越易...

=.=我只係對Maths、Physics同Chem係咁，其他科唔會咁熱愛...
作者: 水龍蜥    時間: 7/1/2005 09:42 PM
Originally posted by 落雷 at 2005-1-7 09:41 PM:
今日份a.maths卷出現相似題目…好彩響試場好快就諗到了- -"

LHS=(1-cscA+cotA)/(1+cscA-cotA)

(1-cscA+cotA)(1+cscA)
=1-cscA+cotA+cscA-cscAcscA+cscAcotA
=1-cscAcscA-cscA+cscA+cotA+cscAcotA
...

好高深,一d都睇唔明
作者: 細薯    時間: 7/1/2005 09:44 PM
Originally posted by oscar at 2005-1-7 09:42 PM:

其實以前中三已經教左log，不過而家既syllabus改曬，越改越易...

=.=我只係對Maths、Physics同Chem係咁，其他科唔會咁熱愛...

yes~my Math. teacher always says that~~
chem is not teaching acid......not so difficult up till now
作者: oscar    時間: 7/1/2005 09:44 PM
Originally posted by 落雷 at 2005-1-7 21:41:
今日份a.maths卷出現相似題目…好彩響試場好快就諗到了- -"

LHS=(1-cscA+cotA)/(1+cscA-cotA)

(1-cscA+cotA)(1+cscA)
=1-cscA+cotA+cscA-cscAcscA+cscAcotA
=1-cscAcscA-cscA+cscA+cotA+cscAcotA
...


下...你咁都得？
有d老屈成分wor...
作者: 抹茶可樂    時間: 7/1/2005 09:49 PM
Originally posted by oscar at 2005-1-7 09:44 PM:


下...你咁都得？
有d老屈成分wor...

真架…個個做到的人都係用「交叉相乘」

又例如Prove sin(A+B)=cos(A+B)
書會教你先Prove tan(A+B)=1
作者: oscar    時間: 7/1/2005 09:52 PM
Originally posted by 落雷 at 2005-1-7 21:49:

真架…個個做到的人都係用「交叉相乘」

又例如Prove sin(A+B)=cos(A+B)
書會教你先Prove tan(A+B)=1


不過都有道理，但係好難諗到呢步...
作者: 水龍蜥    時間: 8/1/2005 04:09 PM
Originally posted by oscar at 2005-1-7 09:52 PM:


不過都有道理，但係好難諗到呢步...

你題數有冇人答你?
作者: oscar    時間: 8/1/2005 07:01 PM
Originally posted by 水龍蜥 at 2005-1-8 16:09:

你題數有冇人答你?

落雷咪答左我lor...
作者: oscar    時間: 9/1/2005 05:54 PM
Originally posted by 落雷 at 2005-1-7 21:41:
今日份a.maths卷出現相似題目…好彩響試場好快就諗到了- -"

LHS=(1-cscA+cotA)/(1+cscA-cotA)

(1-cscA+cotA)(1+cscA)
=1-cscA+cotA+cscA-cscAcscA+cscAcotA
=1-cscAcscA-cscA+cscA+cotA+cscAcotA
...

等等...我check到有好多錯處...
sec(90-A)=-cscA....
跟住(1-cscA+cotA)(1+cscA)在後面漏左個-cotA...
作者: 抹茶可樂    時間: 9/1/2005 07:32 PM
Originally posted by oscar at 2005-1-9 05:54 PM:

等等...我check到有好多錯處...
sec(90-A)=-cscA....
跟住(1-cscA+cotA)(1+cscA)在後面漏左個-cotA...


無問題呀



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