If the angle between `veca` and `vecb` is `(pi)/(3)`, then angle between `2veca` and `-3vecb` is :

If angle between veca and vecb is pi/3 , then angle between veca and -3vecb is

If the angle between veca and vecb is (2pi)/3 and the projection of veca in the direction of vecb is – 2, then |veca| =

If the angle between veca and vecb is 2pi//3 and the projection of veca in the direction vecb is -2, the |veca|=

If veca . vecb =ab then the angle between veca and vecb is

if abs(veca) = 3, abs(vecb)=2 and veca . vecb = 3 , then angle between veca and vecb is:

If |veca|=2,|vecb|=3 and veca*vecb=3 , then the angle between veca and vecb equals :