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
Answer:
thats easy
Step-by-step explanation:
but thanks 4 the points
I do y get this but it might be 4
Answer:

Step-by-step explanation:
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I answer is B your welcome.