Explain how PQ is both a tangent and a chord of the function. What are the applicable point(s) for each. The definition of a tangent line is a straight line that touches a curve/function at only one point. At point P, line PQ does exactly that. A chord, on the other hand, is a line that links two points in a circle or a curve. Seeing that line PQ touches and intersects the curve at point R and point P, it can also be considered a chord.
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