If `veca,vecb and vecc` are non coplanar and unit vectors such that `vecaxx(vecbxxvecc)=(vecb+vecc)/sqrt2)` then the angle between `vea and vecb` is (A) `(3pi)/4` (B) `pi/4` (C) `pi/2` (D) `pi`

If veca,vecb and vecc are non coplanar and unit vectors such that vecaxx(vecbxxvecc)=(vecb+vecc)/sqrt2 then the angle between veca and vecb is (A) (3pi)/4 (B) pi/4 (C) pi/2 (D) pi

If veca,vecb,vecc are three coplanar unit vector such that vecaxx(vecbxxvecc)=-vecb/2 then the angle betweeen vecb and vecc can be (A) pi/2 (B) pi/6 (C) pi (D) (2pi)/3

If |veca.vecb|=sqrt(3)|vecaxxvecb| then the angle between veca and vecb is (A) pi/6 (B) pi/4 (C) pi/3 (D) pi/2

If veca, vecb and vecc are non -coplanar unit vectors such that vecaxx(vecbxxvecc)=(vecbxxvecc)/sqrt2,vecb and vecc are non- parallel , then prove that the angle between veca and vecb "is" 3pi//4

If |vecc|=2 , |veca|=|vecb|=1 and vecaxx(vecaxxvecc)+vecb=vec0 then the acute angle between veca and vecc is (A) pi/6 (B) pi/4 (C) pi/3 (D) (2pi)/3

If veca,vecb,vecc are unit vectors such that veca is perpendicular to vecb and vecc and |veca+vecb+vecc|=1 then the angle between vecb and vecc is (A) pi/2 (B) pi (C) 0 (D) (2pi)/3

If veca,vecb and vecc are non coplaner vectors such that vecbxxvecc=veca , veccxxveca=vecb and vecaxxvecb=vecc then |veca+vecb+vecc| =

If veca, vecb, vecc are any three non coplanar vectors, then (veca+vecb+vecc).(vecb+vecc)xx(vecc+veca)

If veca, vecb and vecc are unit coplanar vectors, then [(2veca-3vecb,7vecb-9vecc,12vecc-23veca)]

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