If `veca and vecb` are unit vectors such that `2veca-4vecb and 10veca+8vecb` are perpendicular to each other, then find the angle between these two vectors.

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

If veca and vecb are two unit vectors such that veca+2vecb and 5veca-4vecb are perpendicular to each other then the angle between veca and vecb is (A) 45^0 (B) 60^0 (C) cos^-1(1/3) (D) cos^-1(2/7)

If veca and vecb are non - zero vectors such that |veca + vecb| = |veca - 2vecb| then

If veca, vecb are unit vectors such that |veca +vecb|=1 and |veca -vecb|=sqrt3 , then |3 veca+2vecb |=

veca and vecb are two vectors such that |veca|=1 ,|vecb|=4 and veca. Vecb =2 . If vecc = (2vecaxx vecb) - 3vecb then find angle between vecb and vecc .

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

If |veca+vecb|=|veca-vecb|, (veca,vecb!=vec0) show that the vectors veca and vecb are perpendicular to each other.

if veca,vecb and vecc are mutally perpendicular vectors of equal magnitudes, then find the angle between vectors and veca+ vecb+vecc .

If veca and vecb are unit vectors such that (veca +vecb). (2veca + 3vecb)xx(3veca - 2vecb)=vec0 then angle between veca and vecb is

If veca and vecb are two vectors, such that veca.vecblt0 and |veca.vecb|=|vecaxxvecb| then the angle between the vectors veca and vecb is (a) pi (b) (7pi)/4 (c) pi/4 (d) (3pi)/4