If a d+b c then prove that the equation (W) (a^2+b^2) x^2+2(a c+b d) x+(c^2+d^2)=0 has no real ro...

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If a d+b c then prove that the equation
(W) (a^2+b^2) x^2+2(a c+b d) x+(c^2+d^2)=0 has no real roots.

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