Problem : What is arcsin()?

arcsin() = .

Problem : What is arccsc()?

arccsc() is undefined. There is no angle whose cosecant is .

Problem : What is arctan(1)?

arctan(1) = .

Problem : What is arccos(1)?

arccos(1) = 0.

Problem : What is arcsin()?

arcsin() is undefined. There are no angles whose sine equals .