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If a+i b=c+i d, then...

If `a+i b=c+i d`, then

A

`a^(2)+c^(2)=0`

B

`b^(2)+c^(2)=0`

C

`b^(2)+d^(2)=0`

D

`a^(2)+b^(2)=c^(2)+d^(2)`

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The correct Answer is:
D
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