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(9)root(4 k)((a+ib)/(c+id))=x+iyvec d wi...

(9)root(4 k)((a+ib)/(c+id))=x+iyvec d widehat f sum_(c^(2)+d^(2))=x^(2)+y^(2)

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If (a+ib)/(c+id)=x+iy prove that, (a^(2)+b^(2))/(c^(2)+d^(2))=x^(2)+y^(2)

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