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If a,b,x,y are real and 3sqrt(x+iy)=a+i...

If a,b,x,y are real and `3sqrt(x+iy)=a+ib` show that , `3sqrt(x-iy)=a-ib` `(x)/(a)+(y)/(b)=4(a^(2)-b^(2)).`

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