If the sides of an angle ar given by vec...

If the sides of an angle ar given by vectors `veca=hati-2hatj+2hatk` and vecb`2hati+hatj+2hatk,` then the internasl bisector for the angle is (A) `3hati-hatj+3hatk` (B) `1/3 (3hati-hatj+4hatk)` (C) `1/3(-hati-3hatj)` (D) `3hati-hatj-4hatk`

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