Answer:
,
,
Above four functions are defined at the given point.
Step-by-step explanation:
We have been given all trigonometric function we need to tell which among them is defined for
Case 1:
Since,
Domain of the function is
Defined at given point.
Case 2:
Domain of the function is
Defined at given point.
Case 3:
Value of the function is not defined because it is out of the domain of the function.
Domain is
So, not defined at given point.
Case 4:
Value of the function is not defined because it is out of the domain of the function.
Domain is
So, not defined at given point.
Case 5:
Domain of the function is
Defined at given point.
Case 6:
Domain of the function is
Defined at given point.
Therefore, Option 1,2,5,6 are correct.