If this is supposed to be

Then this can simply be reduced to

by the double angle formula for cosine
Answer:
1/5 miles
Step-by-step explanation:
2/5 divided by 2 = 1/5
Answer:
f(x) = sin(x)
Step-by-step explanation:
This is the correct answer.
Function means no x value repepetes with a differnt y value
(x,y)
first numbers never repeat
first one, the x values repeat
2nd, x values rpeat
3rd, no repeat
4th, -3 repeats
answer is 3rd option