Question

How do you evaluate `csc 0`?

Answer 1

`csc0` is undefined.

Explanation:

Remember that `csctheta=1/sintheta`.

Now `sin0=0 rArr csc0` is undefined.

In fact, the Domain of `csc` function is

`RR-{kpi : k in ZZ}=RR-{0,+-pi,+-2pi,.................}`, so, `csc0` is not defined.