simplify a power X-y+1. a power y-z +1 a power z-x+1
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=1(1+x+xz)+1(1+(xz)−1+z−1)+1(1+z+x−1)=1(1+x+xz)+1(1+(xz)−1+z−1)+1(1+z+x−1)
=1(1+x+xz)+xz(xz+1+x)+x(x+xz+1)=1(1+x+xz)+xz(xz+1+x)+x(x+xz+1)
=1(1+x+xz)+xz(1+x+xz)+x(1+x+xz)=1(1+x+xz)+xz(1+x+xz)+x(1+x+xz)
=1+x+xz(1+x+xz)=1+x+xz(1+x+xz)
=1
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