if p =x²-yz,r=z²-xy,q=y²-zx then find the value of py + q z + r x
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Gas is one of the four fundamental states of matter. A pure gas may be made up of individual atoms, elemental molecules made from one type of atom, or compound molecules made from a variety of atoms. A gas mixture, such as air, contains a variety of pure gases. Δ←
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