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Question

If the quadratic equation (1+m2)x2+2mcx+c2a2=0 has equal roots, prove that c2=a2(1+m2).

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Solution

Given :-
(Hm2)x2+2 cmx+(c2a2)=0 has equal roots.
B2=4AC
(2 cm)2=4(1+m2)(c2a2)
c2m2=(1+m2)(c2a2)
c2m2=c2a2+C2m2a2m2
c2=a2(1+m2)

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