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If the equation (a^2+b^2)x^2-2(a c+b d)x...

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

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