If `veca.vecb=0 and vecaxxvecb=0` prove that `veca=0 or vecb=vec0`.

If veca.vecb=veca.vecc, vecaxxvecb=vecaxxvecc and veca!=vec0, then prove that vecb=vecc.

If veca= vecP + vecq, vecP xx vecb = vec0 and vecq. vecb =0 then prove that (vecbxx(veca xx vecb))/(vecb.vecb)=vecq

If vecasxxvecb=0 and veca.vecb=0 then (A) veca_|_vecb (B) veca||vecb (C) veca=0 and vecb=0 (D) veca=0 or vecb=0

If veca= vecP + vecq, vecP xx vecb = vec0 and vecq. Vecb =0 then prove that (vecbxx(veca xx vecb))/(vecb.vecb)=vecq

If veca+vecb+vecc=0 , prove that (vecaxxvecb)=(vecbxxvecc)=(veccxxveca)

If veca, vecb and vecc are three vectors such that 3veca+4vecb+6vecc=vec0, |veca|=3, |vecb|=3 and |vecc|=4 , then the value of -864((veca.vecb+vecb.vecc+vecc.veca)/(6)) is equal to

The plane contaning the two straight lines vecr=veca+lamda vecb and vecr=vecb+muveca is (A) [vecr vecas vecb]=0 (B) [vecr veca veca xxvecb]=0 (C) [vecr vecb vecaxxvecb]=0 (D) [vecr veca+vecb vecaxxvecb]=0

If veca,vecb, vecc are three vectors such that veca + vecb +vecc =vec0, |veca| =1 |vecb| =2, | vecc| =3 , then veca.vecb + vecb .vecc +vecc + vecc.veca is equal to

If |veca|=3,|vecb|= 5 and |vecc|=4 and veca+ vecb + vecc =vec0 then the value of ( veca. Vecb + vecb.vecc) is equal tio