If `veca` is a unit vector and `(vecx-veca).(vecx+veca)=8`, then find `|vecx|`.

If veca is a unit vector and (vecx-veca). (vecx+veca)=8 , then find |vex| .

If veca is a unit vector such that (vecx-veca).(vecx+veca)=8 , find |x|.

veca. (veca xx vecb)=

Find |x|, if for a unit vector a (vecx-veca)(vecx+veca)=12

If veca , vecb, vecc and vecd are unit vectors such that (veca xx vecb). (veccxx vecd) =1 and veca. Vecc= 1/2 then :

If (veca+vecb).(veca-vecb)=8 and |veca|=8(vecb) then find |vecb| .

Find |vecb| ,if (veca+vecb) . (veca-vecb)=8 and |veca|=8|vecb| .

If veca,vecb and vecc are unit vectors such that veca+vecb+vecc=vec0 then angle between veca and vecb is

If veca=hati -2 hatj + 3 hatk if vecb is a vector such that veca.vecb=|vecb| and |veca-vecb|=sqrt7, then |vecb|=