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If vec a , vec b , a n d harr c are thr...

If ` vec a , vec b , a n d harr c` are three unit vecrtors such that ` vec axx( vec bxx vec c)=1/1 vec b ,t h e n( vec ba n d vec c` being non-parallel`)` angle between ` vec aa n d vec b` is`pi//3` b.`"a n g l eb e t w e e n" vec aa n d vec c"i s"pi//3` c. a. angle between ` vec aa n d vec b` is`pi//2` d. a. angle between ` vec aa n d vec c` is`pi//2`

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