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Numerical methods
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.. function:: bodied NIntegrate(expr, x, x0, x1)

  numerical integration

  :param x: integration variable
  :param x0: lower integration limit
  :param x1: upper integration limit
  :param expr: integrand

  Numerically integrate ``expr`` over ``x`` from ``x0`` to ``x1``.

  .. seealso:: :func:`Integrate`
