compound angle/double angleI am not quite sure how you were able to manipulate the equation from the 1st line to the second, I understand it, its just I don't know how you were able to know to change it into that form, if that makes sense?
practiceohh okay, I can see that now but I'm just unsure as to how one could know how this would use double angle properties from cos^2alpha
Make sure you know all three versions ofohh okay, I can see that now but I'm just unsure as to how one could know how this would use double angle properties from cos^2alpha
Try to derive it yourself. Use the relationship betweenI am not quite sure how you were able to manipulate the equation from the 1st line to the second, I understand it, its just I don't know how you were able to know to change it into that form, if that makes sense?