I have these sum and product property problems and I just want to make sure my work is right.
Write equations expressing
1. cos 37degrees cos99degrees as a sum
Answer: sin136+(-62)
2. sin4+sin7 as a product
Answer: 2sin5.5 sin-1.5
3. cos 8x - cos 2x as a product
Answer -2sin5x sin3x
4. cos5x sin9x as a sum
Answer sin14x - (-4)
Idk...I just don't feel as confident about these.
1 answer