Question

if the sum of two unit vectors is a unit vector, then the angle between them is​

Answer 1

cos^-1 (-1/2)

Step-by-step explanation:

R^2 = 1^2 + 1^2 + 2(1)(1) cosx

1^2 = 2 + 2cosx

-1/2 = cosx

x = cos^-1 (-1/2)

Answer 2

Answer:

Step-by-step explanation:R^2 = 1^2 + 1^2 + 2(1)(1) cosx

1^2 = 2 + 2cosx

-1/2 = cosx

x = cos^-1 (-1/2)