QuadG2Basis.h

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basis[0] = 0.69444444444444431 * rr * ss * (rr - 0.7745966692414834) * (ss - 0.7745966692414834);
basis[1] = -1.0758287072798378 * ss * (rr - 0.7745966692414834) * (1.2909944487358056 * rr + 1.0) *
  (ss - 0.7745966692414834);
basis[2] =
  1.0758287072798378 * rr * ss * (0.6454972243679028 * rr + 0.5) * (ss - 0.7745966692414834);
basis[3] = -1.0758287072798378 * rr * (rr - 0.7745966692414834) * (ss - 0.7745966692414834) *
  (1.2909944487358056 * ss + 1.0);
basis[4] = 1.6666666666666665 * (rr - 0.7745966692414834) * (1.2909944487358056 * rr + 1.0) *
  (ss - 0.7745966692414834) * (1.2909944487358056 * ss + 1.0);
basis[5] = -1.6666666666666665 * rr * (0.6454972243679028 * rr + 0.5) * (ss - 0.7745966692414834) *
  (1.2909944487358056 * ss + 1.0);
basis[6] =
  1.0758287072798378 * rr * ss * (rr - 0.7745966692414834) * (0.6454972243679028 * ss + 0.5);
basis[7] = -1.6666666666666665 * ss * (rr - 0.7745966692414834) * (1.2909944487358056 * rr + 1.0) *
  (0.6454972243679028 * ss + 0.5);
basis[8] =
  1.6666666666666665 * rr * ss * (0.6454972243679028 * rr + 0.5) * (0.6454972243679028 * ss + 0.5);