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Let f(x) = |(x^2,kx,4+kx),(kx,4+kx),x^2)...

Let f(x) = `|(x^2,kx,4+kx),(kx,4+kx),x^2),(4+kx),x^2,kx)|` If f(x) is positive for all `x in R`, the find the number of integral values in the range of k.

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