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وەسفLagrange polynomial.svg
English: This image shows, for four points ((−9, 5), (−4, 2), (−1, −2), (7, 9)), the (cubic) interpolation polynomial L(x) (dashed, black), which is the sum of the scaled basis polynomials y1ℓ1(x), y2ℓ2(x), y3ℓ3(x) and y4ℓ4(x) (colors). The interpolation polynomial passes through all four control points, and each scaled basis polynomial passes through its respective control point and is 0 where x corresponds to the other three control points.
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