Newton cotes formulae proofs

  1. I am looking for two proofs they both are based on newton cotes formulae which is is in the equi spaced points xi=a+ih with h=(b−a)/n and i=0,…,n.

    First proof is for ωj=ωn−j
    The second one is ∑jωj=(b−a)
    ω is the weight

    Does anyone have a link where its explained or can someone properly show how to prove them ?
  2. jcsd
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