VectorHard

Question

are mutually perpendicular vectors fo equal magnitude then angle between and   is -

Options

A.cos-1
B.cos-1
C.π - cos-1
D.cos-1√2

Solution

are unit vector mutually perpendicular to each other then angle between is given by
cos θ =
= 
⇒  cos θ = or θ = cos-1 = tan-1 √2

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