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If (a+ib)(c+id)(e+if)(g+ih)=A+iB, then s...

If (a+ib)(c+id)(e+if)(g+ih)=A+iB, then show that `(a^2+b^2)(c^2+d^2)(e^2+f^2)(g^2+h^2)=A^2+B^2`

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PATHFINDER-COMPLEX NUMBER-QUESTION BANK
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