write the following in expanded form, ( x/y +y/z+z/x) ^2
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(a+b+c)^2 = a^2+b^2+c^2+2ab+2bc+2ca
(x/y+y/z+z/x) = (x/y)^2+(y/z)^2+(z/x)^2+2*x/y*y/z+2*y/x*z/x+2*z/x*x/y
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