Question

If the diagonals of the quadrilateral formed by the lines l1x + m1 y + n1= 0,
l2x+m2 y + n2 = 0, l1x + m1y+n1' = 0 and l2x + m2y + n2' = 0 are perpendicular,
then write the value of l1^2 -l2^2+m1^2-m2^2​

Answer 1

Step-by-step explanation:

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