If vec aa n d vec b are two unit vector...

If ` vec aa n d vec b` are two unit vectors and `theta` is the angle between them, then the unit vector along the angular bisector of ` vec a` and ` vec b` will be given by a. `( vec a- vec b)/(cos(theta//2))` b. `( vec a+ vec b)/(2cos(theta//2))` c. `( vec a- vec b)/(2cos(theta//2))` d. none of these

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