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If a + ib = c + id, then...

If a + ib = c + id, 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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