if vectors are A= i+j+k and vector B = -i-j-k,then find the angle between vector (A - B) and A - Physics - Motion In A Plane

Question

if vectors are A= i+j+k and vector B = -i-j-k,then find the
angle between vector (A - B) and A

Neha Gupta · Accepted Answer

A → = i⏜ + j⏜ + k⏜B→ = -i⏜ -
j⏜ - k⏜Let C→ = A→ - B→ = 2i⏜ +
2j⏜ + 2k⏜Magnitude of A→ = A = 1+1+1 3C = 4+4+4 =
23dot product between A→ and C→A→ C→ = AC
cos θwhere θ is angle between (A-B) and A 2+2+2 = 3 23
cos θ cos θ = 1θ = 0o

if vectors are A= i+j+k and vector B = -i-j-k,then find the angle between vector (A - B) and A.