y=1/0

If every function has "negative odd end behaviour" an "odd" function? Explain our answer, illustrating it with an example.

For what values of x is an element of real numbers, will y = 1/sin(x) be undefined? (Where x is understood to be measured in degrees.) I know that for it to be undefined, sin(x) must be 0. Given this I know that x is undefined at: 0,180,360... How would I...

A student writes, "The inverse of y = -√(x+2) is y = x^2 - 2." Why is this statement false? I don't understand how it isnt the inverse. The textbook says that changing the domain will make it the inverse? Wouldn't that only make it a function?