Question

The angle between vectors A= ȋ + ĵ and B = ȋ - ĵ is :

Answer 1

Answer:

here use dot product of vectors

Explanation:

Divide the dot product by the product of magnitudes of the two vectors the dot product is 0

hence cos(theta)=0

so theta=90°

Answer 2

Explanation:

A= I+j

B= i-j

so magnitude of A=√1+1= √2

magnitude of B=√1+1= √2

now A.B= 1×1-1×1

A.B= 0

so cos theta= A.B/|A||B|

cos theta= 0/2

so theta = 90°