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7.1: Похідні
https://ukrayinska.libretexts.org/%D1%84%D1%96%D0%B7%D0%B8%D0%BA%D0%B8/%D0%9C%D0%B0%D1%82%D0%B5%D0%BC%D0%B0%D1%82%D0%B8%D1%87%D0%BD%D0%B0_%D1%84%D1%96%D0%B7%D0%B8%D0%BA%D0%B0_%D1%96_%D0%BF%D0%B5%D0%B4%D0%B0%D0%B3%D0%BE%D0%B3%D1%96%D0%BA%D0%B0/%D0%9E%D0%B1%D1%87%D0%B8%D1%81%D0%BB%D1%8E%D0%B2%D0%B0%D0%BB%D1%8C%D0%BD%D0%B0_%D1%84%D1%96%D0%B7%D0%B8%D0%BA%D0%B0_(Chong)/07%3A_%D0%9A%D1%96%D0%BD%D1%86%D0%B5%D0%B2%D0%BE-%D1%80%D1%96%D0%B7%D0%BD%D0%B8%D1%86%D0%B5%D0%B2%D1%96_%D1%80%D1%96%D0%B2%D0%BD%D1%8F%D0%BD%D0%BD%D1%8F/7.01%3A_%D0%9F%D0%BE%D1%85%D1%96%D0%B4%D0%BD%D1%96
$\psi_{n+1} = \psi_n \,+\, h\, \psi'(x_n) \,+\, \frac{h^2}{2}\psi''(x_n) \,+\, \frac{h^3}{6}\psi'''(x_n) \,+\, \frac{h^4}{24}\psi''''(x_n) + O(h^5)$ \[\psi_{n+1} = \psi_n \,+\, h\, \psi'(x_n) \,+\,... $\psi_{n+1} = \psi_n \,+\, h\, \psi'(x_n) \,+\, \frac{h^2}{2}\psi''(x_n) \,+\, \frac{h^3}{6}\psi'''(x_n) \,+\, \frac{h^4}{24}\psi''''(x_n) + O(h^5)$ $\psi_{n+1} = \psi_n \,+\, h\, \psi'(x_n) \,+\, \frac{h^2}{2}\psi''(x_n) \,+\, \frac{h^3}{6}\psi'''(x_n) \,+\, \frac{h^4}{24}\psi''''(x_n) \,+\, O(h^5)$ $\psi_{n-1} = \psi_n \,-\, h\, \psi'(x_n) \,+\, \frac{h^2}{2}\psi''(x_n) \,-\, \frac{h^3}{6}\psi'''(x_n) \,+\, \frac{h^4}{24}\psi''''(x_n) \,+\, O(h^5)$