Answer: 
Step-by-step explanation:
We need to apply the following identity:

Then, applying this, you know that for
:

We need to remember that:
and 
Therefore, we need to substitute these values into
.
Then, you get:



Answer:
D-both a relation and a function
Step-by-step explanation:
Wouldn’t it be negative because it’s below the number line
(12)(20)= 240
The answer is going to be B. 240 sq ft
Use a half-angle identity to find the exact value of sin pi/8