So the question is this: for which angles is the following statement true: ?
To answer that, you must first find the angles for which equality holds.
I've already sketched the grpah of y = cosx for 0 <(less than or equal to) x <(less than or equal to) 360 but the problem im having is where it askes me to hence solve negative square root 3 over 2 <(less than or equal to) cosx <(less than or equal to) square root 3 over 2 ==