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If non-zero vectors vec aa n d vec b ar...

If non-zero vectors ` vec aa n d vec b` are equally inclined to coplanar vector ` vec c ,t h e n vec c` can be a. `(| vec a|)/(| vec a|+2| vec b|)a+(| vec b|)/(| vec a|+| vec b|) vec b` b. `(| vec b|)/(| vec a|+| vec b|)a+(| vec a|)/(| vec a|+| vec b|) vec b` c. `(| vec a|)/(| vec a|+2| vec b|)a+(| vec b|)/(| vec a|+2| vec b|) vec b` d. `(| vec b|)/(2| vec a|+| vec b|)a+(| vec a|)/(2| vec a|+| vec b|) vec b`

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