what is ∣ 1 / sinα－ 1/ cos α∣?

|x| means the absolute value of x.
For example |2| = 2, |-4| = 4 etc.
Graph for y = |x|:

圖片參考：http://images.encyclopedia.com/utility/image.aspx?id=2793339&imagetype=Hero


2011-09-16 21:42:20 補充：
I don't quite understand your question...

2011-09-16 22:25:49 補充：
Yes~~~~~~~

Jason, for 004, you should say "I'm going to choose your answer as the best solution after 3 hours", Your sentence is a Chinglish one.

do u mean:

no matter x=a or -a,
|x|=a

right?

2011-09-16 22:26:33 補充：
im going to choose u the best 3 hrs later!

2011-09-17 13:32:32 補充：
Ah.. Thx...