
Now complete the following proof:
8  AQ = ____________________ (in terms of a and c) 
9  
10  so, WC = ________________________ 
11  Then, WA = ______________________ (in terms of a, b, and ) 
12  Now, recall from geometry that ). Why? _______________________ 
13  Substituting in step 12, (2a cos C)(b) = ( ) ( ) 
14  Simplifying step 13 and solving for c^{2}, we obtain c^{2} = ____________________ 