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If the roots of the equation (a^2+b^2)...

If the roots of the equation `(a^2+b^2)x^2-2b(a+c)x+(b^2+c^2)=0` are equal, then
(a)`2b=a+c` (b) `b^2=a c` (c) `b=(2a c)/(a+c)` (d) `b=a c`

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