Question

Find the domain of the given equation

Answer 1

Answer:

because

$\sqrt{1 - \cos(x ) }$

lies within the root it is positive

cos x<1

x belongs to R

Answer 2

Answer:

clearly f(x) is well defined when the value of 1-cos x is positive and is not equal to zero.

It means the value of x has domain (-1,0) and (0,1)