19^2 or 361 is the answer to the equation
Okay there is going to be a 90°, 45°, and a 45° atleast
Step 1: Convert
, which is in radians into degrees. To convert it multiply by 

900/12
75
Step 2: 75 degrees isn't on the unit circle but 45 degrees and 30 degrees is. Since 45 + 30 = 75 you can use the cosine of 45 and 30 to find the exact value
cos45 = 
cos30 =
Step 3: Add the cos45 and cos30 to get cos5pi/12

Hope this helped!
Answer:
19
Step-by-step explanation:
Since the equation is given in vertex form, you can easily find the vertex.
The vertex form of the equation of a parabola is

. The vertex is (h, k).
In your question, the vertex is
(-3, 6).