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1. ### definite integral

1) ∫ (x = π/4 → π/3) (sec x + tan x)/(sec x - tan x) dx = ∫ (x = π/4 → π/3) (sec x + tan x)2/(sec2 x - tan2 x) dx = ∫ (x = π/4 → π/3) (sec2 x + 2 sec x tan x + tan2 x) dx = ∫ (x = π/4 → π/3) (2sec2 x + 2 sec x tan x - 1) dx = [2 tan x + 2 sec x - x] (x = π/4 → π/3) = (2√3 + 4 - π/3) - (2 + 2√2 - π/4) = 2(1 + √3 - √2) - π/12 2) ∫ (x...

分類：科學及數學 > 化學 2011年04月24日

2. ### definite integral

1) 圖片參考：http://i1191.photobucket.com/albums/z467/robert1973/Mar11/Crazyint14.jpg aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa...

分類：科學及數學 > 化學 2011年03月28日

3. ### 點解atomic emission spectra入面, d lines係discrete既而唔係continuous?

each line represents a definite energy change associated with the transition of an excited electron from...

分類：科學及數學 > 化學 2007年08月26日

4. ### hydrogen gei spectrum 點解會係discerete line

...4)The energy will be re-emitted as EM wave..which is a definite amount of energy.. 5)so we look at the spectrum,we can find that there are numerial...

分類：科學及數學 > 化學 2007年06月13日

5. ### requirements for studying pahrmacy

...major science subject is Chemistry. A good result would be a definite advantage. For Biology, it may be a little bit help. For ...

分類：科學及數學 > 化學 2007年08月01日

6. ### what are the different between compounds and covalent compou

... by chemical union of two or more elements or ingredients in definite proportion by weight <two or more elements> --- different ...

分類：科學及數學 > 化學 2007年12月18日

7. ### chem mc

...different in component, and the portion are also different; so, there will not be a definite concentration for any substances in the undiluted toilet cleaner(...

分類：科學及數學 > 化學 2012年03月14日

8. ### 化學題--melting and boiling

... the question must state at room temperature or pressure, or there is no definite solution. Under room temperature/ 25 degree celsius A is at liquid...

分類：科學及數學 > 化學 2009年07月14日

9. ### I need some I.S. information (Anything about I.S.)(20分)

A chemical substance is any material with a definite chemical composition.[1] For example, a sample of water has the same ...

分類：科學及數學 > 化學 2007年01月08日

10. ### what are the mixture and compound different?

...1) Homogeneous mixtures are mixtures that have a definite composition and properties. You can&#39;t really see the substance that...

分類：科學及數學 > 化學 2006年12月02日