Answer:
The points are (0,-1) (1,-1)
Step-by-step explanation:
3.0 NOT SURE IF ITS CORRECT
Because you are not adding the x's .When you add the coefficients, the variable comes along with it.
The cotangent function is defined as the ratio between cosine and sine of a given angle, i.e.

Since you can't have zero at the denominator, the cotangent function is not defined when the sine is zero.
Let's look at your option:
, so the cotangent is defined here
, so the cotangent is not defined here
, so the cotangent is defined here
, so the cotangent is defined here