If the equation (1+m2)x2+2mcx+c2-a2=0 have equal roots prove that, c2=a2 (1+m2).
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its discriminant will be zero
(2mc)^2-4(c^2-a^2)(1+m^2)=0
now solve
(2mc)^2-4(c^2-a^2)(1+m^2)=0
now solve
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