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x +y = √3 +1)/√3 -1. + (√3 -1)/√3 +1
= (√3 +1)^2 + ( √3 -1)^2)/ √3-1)(√3+1)
= 3 + 1 +2√3 + 3 + 1 -2√3)/ 3 -1
= 8 /2
= 4
x -y = (√3 +1)^2 - ( √3 -1)^2)/ 2
= 3 +1 +2√3 -3 -1 +2√3)/2
= 2√3
xy = 1
x^2 - y^2 + xy
(x-y)( x+y) + 1
8√3 + 1
= (√3 +1)^2 + ( √3 -1)^2)/ √3-1)(√3+1)
= 3 + 1 +2√3 + 3 + 1 -2√3)/ 3 -1
= 8 /2
= 4
x -y = (√3 +1)^2 - ( √3 -1)^2)/ 2
= 3 +1 +2√3 -3 -1 +2√3)/2
= 2√3
xy = 1
x^2 - y^2 + xy
(x-y)( x+y) + 1
8√3 + 1
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Pure calcium carbonate can be produced from marble, or it can be prepared by passing carbon dioxide into a solution of calcium hydroxide. In the later case calcium carbonate is derived from the mixture, forming a grade of product called "precipitated calcium carbonate,” or PCC.
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