Cos(arcsin(u)) = √(1 - u²)
_____
You want cos(α) where sin(α) = u.
You know that
cos(α)² + sin(α)² = 1
cos(α)² = 1 - sin(α)² = 1 - u²
cos(α) = √(1 - u²)
5 1/3
8 2/15
2 4/5 change to 2 12/15
8 2/15 change to 7 17/15
-2 12/15
7 17/15
-2 12/15
——-——
5 5/15 reduced to 5 1/3
CAN EXPLAIN FURTHER
The fraction is 1/3. on the input side, it’s going up by one, (6,7,8 etc) and on the output side it’s going up by 3. (18+3=21). if u were to double check 6/18 reduces to 1/3! so the answer is 1/3
Answer:
B
Step-by-step explanation:
substitute
6+4=10
12-3=9
4-9=-5