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For any scalar p prove that =|[x,x^2, 1+...

For any scalar `p` prove that `=|[x,x^2, 1+p x^3],[y, y^2, 1+p y^3],[z, z^2 ,1+p z^3]|=(1+p x y z)(x-y)(y-z)(z-x)` .

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