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Question

The equation of the bisector of the angle between two lines 3x4y+12=0 and 12x5y+7=0 which contains the points (1,4) is-

A
21x+27y+121=0
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B
21x27y+121=0
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C
21x+27y+191=0
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D
3x+4y125=12x5y+713
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Solution

The correct option is D 21x27y+121=0
Given two lines are 3x4y+12=0,12x5y+7=0
The angular bisectors will be 3x4y+125=±12x5y+713
65x52y+156=±(60x25y+35)
The equations of the angular bisectors are 5x27y+121=0,125x77y+191=0
(1,4) lies on the line 5x27y+121=0

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