# In #triangle ABC#, #a=4,b=6, c=8#, how do you find the cosine of each of the angles?

##### 1 Answer

Use 3 forms of Law of Cosines :

Solve for cosines

#### Explanation:

The first form of the Law of Cosines :

Solve for cos(A):

Substitute, 4 for a, 6 for b, and 8 for c:

The second form:

Solve for cos(B):

Substitute, 4 for a, 6 for b, and 8 for c:

The third form:

Solve for cos(C):

Substitute, 4 for a, 6 for b, and 8 for c: