Factor completely.
2 12 -

(x-1) (x+1) ((x^2)+1) ((x^2)-x+1) ((x^2)+x+1) ((x^4)-(x^2)+1)

“exterior angles of triangles. an exterior (or external) angle is the angle between one side of a triangle and the extension of an adjacent side. try this drag the orange dots on any vertex to reshape the triangle.” look to get to the answer i explained what it means and other things i hope it you .

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