Answer:

Step-by-step explanation:
Assuming you want to solve
,

Recall the double angle identity:

Then

Answer: its either A or C, but im p sure its C
Answer:
circle a and circle b must exist
Step-by-step explanation:is circle a and circle b did not exist this question would not be one
Answer:
0.5289 to the nearest thousandth is 0.529.
Step-by-step explanation: If a number is less than 5, round down, but if a number is 5 or more, round up. The digit after the thousandths place is the digit we should look at to answer the question and it is 9, so we round up from 0.528 or 0.529. So, the answer is 0.529.