If absvec(a)=absvec(b)=1" such that "vec...

If `absvec(a)=absvec(b)=1" such that "vec(a)+2vec(b)and5vec(a)-4vec(b)` are perpendicular to each other, then the angle between `vec(a)andvec(b)` is

`45^(@)`

`60^(@)`

`cos^(-1)""(1)/(3)`

`cos^(-1)""(2)/(7)`

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SURA PUBLICATION-APPLICATIONS OF VECTORA ALGEBRA-ADDITIONAL QUESTIONS ( Choose the Correct or the most suitable answer from the given four alternatives : )

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