Simplify the question in the attachment.
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a^x+y (y²-xy+x²) a ^y+z(y²-yz+z²)a^z+x(z²-zx+x²)
a^y²x-x²y +x³ +y³-xy²+x²y +y³-y²z +z²y +zy²-yz²+z³
+z³-z²x+x²z + xz²-zx² +x³
a⁰ =1
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