Classify each of the quadratic as positive definite, positive semi definite, negative definite, negative semi definite, or

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Classify each of the quadratic as positive definite, positive semi definite, negative definite, negative semi definite, or indefinite.

2x21 + 2x22 + 2x23 + 2x1x2 + 2x1x3 + 2x2x3

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