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Q.

If the roots of the quadratic equation x−mmx+1=x+nnx+1 are reciprocal to each other, then

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a

m=n

b

m+n=1

c

m2+n2=1

d

n=0

answer is D.

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Detailed Solution

Given x−mmx+1=x+nnx+1x-mnx+1=x+nmx+1⇒ x2(m−n)+2mnx+(m+n)=0 Roots are α,1α respectively, then α⋅1α=m+nm−n⇒ m−n=m+n⇒n=0.
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If the roots of the quadratic equation x−mmx+1=x+nnx+1 are reciprocal to each other, then