Q:(questions 1 to 6 are about trigonometric function)
1.what is csc?
2.what is sec?
3.what is the relation between csc, sec,tan,cot,sin and cos?
4.what is the whole spelling of csc, sec,tan,cot,sin and cos?
5.what is the picture of csc?
6.what is the picture of sec?
7.there are some mathematical signs looks like : ~ , ^ , -->
8.what is f ' (x)?
Thank you very much~^^