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Question

Let P=(1,0),Q=(0,0) and R=(3,33) be three points. The equation of the bisector of the angle PQR is

A
32x+y=0
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B
x+3y=0
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C
3x+y=0
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D
x+32y=0
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Solution

The correct option is D 3x+y=0
Slope of the required angle bisector is tan120=3

Hence equation of the angle bisector is y=3(x0)3x+y=0

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