Question

If A = i+j and B=i-j then angle between them is

Answer 1

A = √(1^2 + 1^2) = √2
B = √(1^2 + 1^2) = √2
Magnitude of both the vectors is √2

Dot product
A.B = (i + j) . (i - j)
A.B = 1 - 1 = 0

Dot product of two vectors is equal to ABCosx
A.B = ABCosx
0 = √2 × √2 × Cosx
0 = Cosx
∴ x = 90°

Angle between them is 90°

Answer 2

Answer:

90

hope it's help

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