Hi, I am stuck these types of questions and I just can't make any sense of them.

Do I apply compound angles or double angles or the simple trigno functions?

Kindly show me a few steps and I will take it from there.

Q) Find all the angles between 0 and 360 which satisfy the following equations:

1)

2)

3)

Another question is that when they say sin40 or sin10+40, the 40,10 and 40 are all angles right, even if they don't write the degree sign on them?

Thanks!