Mathematics

Problem

Let

A(1, 2, 3)

B(0, 0, 1)

and

C(-1, 1, 1)

are the vertices of

\triangle ABC

. The equation of internal angle bisector through

A

to side

BC

is a.

r = \hat{i} + 2\hat{j} + 3\hat{k} + \mu(3\hat{i} + 2\hat{j} + 3\hat{k})

r = \hat{i} + 2\hat{j} + 3\hat{k} + \mu(3\hat{i} + 4\hat{j} + 3\hat{k})

r = \hat{i} + 2\hat{j} + 3\hat{k} + \mu(3\hat{i} + 3\hat{j} + 2\hat{k})

r = \hat{i} + 2\hat{j} + 3\hat{k} + \mu(3\hat{i} + 3\hat{j} + 4\hat{k})