can roots be at the same points as POI's? because when I set my original equation to zero and I set my second derivative equation to zero i get the same answer? is it possible that roots can be same as the POI's.
cos(x/2)/2 is my derivative. and when I set it equal to 0, i try to solve for x.
cos(x/2)=0/2 this is the part where i'm stuck...a friend of mine did the rest and he came up with whats on the bottom, but I don't know how he did it or if its right...help?