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Derive or prove the three point backward difference approximation of the first derivative, aka Dh--f, of...

Derive or prove the three point backward difference approximation of the first derivative, aka Dh--f, of a function f(x), using either polynomial interpolant method (Newton's or Lagrange's) here is the first derivative approximation: f'(x) = (3* f(x) - 4*f(x-h)+ f(x-2h)) /2h , which is congruent to Dh--f

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Doubt in this then comment below..i will explain you..

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Please thumbs up for this solution..thanks..

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here i use langrange interpolation

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