If M is the midpoint of the side BC of triangle ABC. Let vector AB =a and vector AC = b
a ) Find vectors AM and CM in terms of a and b
i got
AM = (3b+a)/2 , CM=(a+b)/2
part b)
Show that |AM|^2 +|CM|^2 = 1/2 (|AB|^2 + |AC|^2)
Need help with part b, I tried to sub in the vectors into the...