I need to find the intersections of 3sin(2x) and y=2. I can expand sin(2x) with a double angle formula but I'm not getting the answers. The range is 0 - 360.
I can see no reason to use a double angle formula: y= 3sin(2x)= 2 so sin(2x)= 2/3. Use a calculator to find and then divide by 2. sin(180- x)= sin(x) so to get the other value, subtract the 2x your calculator gives you from 180.