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[" If "(a+ib)(c+id)=x+iy," show that "],...

[" If "(a+ib)(c+id)=x+iy," show that "],[[" (i) "(a-ib)(c-id)=x-iy," (ii) "(a^(2)+b^(2))(c^(2)+d^(2))=x^(2)+y^(2),=x^(2)+y^(2)]]

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