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Question

Area of the triangle formed by the line x+y=3 and the angle bisectors of the pairs of straight lines x2y2+2y=1 is?

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Solution

x2y2+2y=1
x2=(y1)2
Hence, the two lines are =
y=x+1 and y=x+1
Equation of angle bisectors of these lines
x=0 and y=1
Intersection between the 3 lines is
A(0,3),B(0,1),C(2,1)
It can be seen that as the points A and B lie on y-axis only and BC is parallel to x-axis. Hence, ABC is a right angled triangle.
Area=12×AB×BC
12×2×2
2


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