Whats the answer

Question

Which of the following is not in the domain of cot(x)? Select all correct answers.

Select all that apply:

−3π2

−π

0

π2

2π

5π2

Answer 1

-pi, 0 and 2pi are not in the domain

as they make cot(x) undefined

cot(0) = 1/0 which is undefined

cot(-pi) = cot(pi) = 1/0 which is undefined

cot(2pi) = cot(0) = 1/0 which is undefined