Answer:
a
Step-by-step explanation:
A><span><span>−b</span>−<span>4
Hope this helps. c:</span></span>
Answer:
81x^4+216x^3+216x^2+96x+16
Step-by-step explanation:
Answer:

Step-by-step explanation:
The Law of Cosines is given as:
.
Plugging in given values, we get:
.