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If (a+i b)/(c+i d)=x+i y , prove that (a...

If `(a+i b)/(c+i d)=x+i y ,` prove that `(a-i b)/(c-i d)=x-i ya n d(a^2+b^2)/(c^2+d^2)=x^2+y^2dot`

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