1.

Let a^r and b^bot are two vectors making angle theta with each other , unit vectors along bisector of a^r and b^bot is :

Answer»

`pm (HATA+ hatb)/2`
`pm(hata+hatb)/(2COS theta)`
`pm(hata+hatb)/(2costheta//2)`
None of these

Solution :`(hata+hatb)/(|hata+hatb|)` will be the BISECTOR of the given vectors
`|hata+hatb|^2=|hata|^2+|hatb|^2 + 2hata.hatb`
1+1+2 cos `theta`
`=2(1+cos theta)`
`=2xx2 cos^2 theta//2`
`=4 cos^2 theta//2`
SINCE `pm (hata + hatb)/(2 cos theta//2)`


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