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Q.

Let A(3,2,0),B(5,3,2),C(−9,6,−3) are three points forming a triangle. If AD , the  bisector of ∠BAC meets BC in D, then coordinates of D are

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a

−198,5716,1716

b

198,−5716,1716

c

198,5716,−1716

d

198,5716,1716

answer is D.

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Detailed Solution

A = 3,2,0 ,  B=( 5,3,2) , C -9,6,-3AB = 4+1+4 =3  ,  AC =144+16+9 =13AD = angular bisector  of ∠ BAC since  BD : DC = 3 :13   ⇒  D =-27+6516,18+3916'-9+2616,    by section formula                                          = 3816,5716,1716    =198,5716,1716
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