Answer:
The value of cosine is
.
Explanation:
It is given that an angle
, with the point (12,-5) is on its terminating side, then the adjacent sides has measure =12 and the opposite side has measure =-5.
Now, from the figure drawn, using the Pythagoras theorem, we have

⇒

⇒

⇒

⇒

Thus, the value of hypotenuse is 13units.
Now, the value of cosine is given as:

⇒

Therefore, the value of cosine is
.