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Vectors 3 vec a-5 vec ba n d2 vec a= vec...

Vectors `3 vec a-5 vec ba n d2 vec a= vec b` are mutually perpendicular. If ` vec a+4 vec ba n d vec b- vec a` are also mutually perpendicular, then the cosine of the angel between `aa n db` is `(19)/(5sqrt(43))` b. `(19)/(3sqrt(43))` c. `(19)/(2sqrt(45))` d. `(19)/(6sqrt(43))`

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Vectors 3vec a-5vec b and2vec a+vec b are mutually perpendicular.If vec a+4vec band vec b-vec a are also mutually perpendicular,then the cosine of the angel between aandb is a.(19)/(5sqrt(43)) b.(19)/(3sqrt(43)) c.(19)/(2sqrt(45)) d.(19)/(6sqrt(43))

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A DAS GUPTA-Product of two Vectors-Exercise
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