Question

If a and b are two sides of a parallelogram and c and d are the diagonals, then C ^ 2 - D ^ 2 = 4ABcosAB
where AB is the angle between vectors A and B​

Answer 1

Step-by-step explanation:

.c2 + d2 = a2 + b2

B.c2-d2= a2-b2

C.c2+ d2=2(a2+ b2)

D.c2- d2= 2(a2- b2)

hope it's help you