It is already in identity.
cos (x - y) - cos (x + y) = 2 sin(x) sin (y)
Yearly salary would be 240,000 for 5,000 and 48,000 for 1,000 a week
I believe it’s b- it might not be correct I believe
Answer:

Step-by-step explanation:
There's a calculated explanation below. I hope this helps!