Vectors `3veca-5vecb and 2veca + vecb` are mutually perpendicular. If `veca + 4 vecb and vecb - veca` are also mutually perpendicular, then the cosine of the angle between `veca nad vecb` is

Vectors 3veca-5vecb and 2veca + vecb are mutually perpendicular. If veca + 4 vecb and vecb - veca are also mutually perpendicular, then the cosine of the angle between veca and vecb is (a) 19/(5sqrt43) (b) 19/(3sqrt43) (c) 19/(sqrt45) (d) 19/(6sqrt43)

Given that veca and vecb are unit vectors. If the vectors vecp=3veca-5vecb and vecq=veca+vecb are mutually perpendicular, then

If veca and vecb are mutually perpendicular unit vectors , then (3veca+2vecb).(5veca-6vecb)=

If the vectors veca and vecb are mutually perpendicular, then veca xx {veca xx {veca xx {veca xx vecb}} is equal to:

If the vectors veca and vecb are mutually perpendicular, then veca xx {veca xx {veca xx {veca xx vecb}} is equal to:

If veca and vecb are two unit vectors such that veca + 2 vecb and 5 veca - 4 vecb are perpendicular to each other, then the angle between veca and vecb is :

Let veca and vecb be two unit vectors. If the vectors : vecc=veca+2vecb and vecd=5veca-4vecb are perpendicular to each other, then the angle between veca and vecb is :

If vector (veca+ 2vecb) is perpendicular to vector (5veca-4vecb) , then find the angle between veca and vecb .

If (veca + 3 vecb) is perpendicular to ( 7 veca - 5 vecb) and ( veca - 4 vecb) is perpendicular to ( 7 veca - 2 vecb) , then the angle between veca and vecb ( in degrees ) is ______