What does the rest of the problem say?
Answer:
cos(C)
Step-by-step explanation:
Recall that the sine ratio is opposite over hypotenuse.

Also the cosine ratio is adjacent over hypotenuse.

The tangent ratio does not come close because it doesn't involve the Hypotenuse.

Answer:
(7,4)
Step-by-step explanation:
all you do is add them together

To factor -1/8 out you need to find a number that multiply by -1/8 be equal to each term in the expression.
To find those numbers you divide each term into -1/8:

Then, the factors are: