We can solve this problem by means of the reference angle approach, which consistes in locate the reference angle (the one that makes the arms of the given angle with the x-axis), construct the right triangle and apply the definitions of the trigonometric functions. Then, lets draw a picture of our problem:
Then, the trigonometric function value of angle theta will be the same as the trigonometric value of the reference angle alpha, for instance,
Then, by applying the definition of the cotangent function:
we have that
We can simplify this result as follows
Therefore, the answer is: