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

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

A

ad=bc

B

`(a)/(c)+(b)/(d)=0`

C

`(a)/(d)=(b)/(c)`

D

`a+b=c+d`

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The correct Answer is:
A
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