If and , then the angle between and…

MATHEMATICS · Single correct · CBSE · Mathematics · Vector Algebra · Vector Algebra

Problem

If (a+3b)⋅(7a−5b)=0(a+3b)\cdot(7a-5b)=0 and (a−4b)⋅(7a−2b)=0(a-4b)\cdot(7a-2b)=0, then the angle between aa and bb is (1) 60∘60^\circ (2) 30∘30^\circ (3) 90∘90^\circ (4) None of these

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