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A triangle is formed by the lines x+y=0 , x-y=0 and lx+my+1=0. If l and m vary subject to the condition l 2 +m 2 =1, then the locus of the circumcentre of the triangle is? (Answer given in the book is (x 2 -y 2 ) 2 = x 2 +y 2 ) A triangle is formed by the lines x+y=0 , x-y=0 and lx+my+1=0. If l and m vary subject to the condition l2+m2=1, then the locus of the circumcentre of the triangle is?(Answer given in the book is (x2-y2)2 = x2+y2)
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