Question

.

Answer 1

See,

\(\csc \theta = \cfrac{1}{\sin \theta}\)

Right?

Answer 2

Yeah, basically, you need to find when does the RHS becomes undefined or of indeterminate form.

When is sin theta = 0 ?

Answer 3

Right... so, we can say that csc theta is undefined when theta = integral multiples of pi.

Answer 4

and for the other values, its true...

yeah! that's right

Answer 5

You're welcome :-)