Which of the following refers to backward - difference formula? Why? You can give your own example to answer the question why. a.) f'(x) = y ≈ Y₁+1, b.) f'(x₁) = y₁ ~ Yi-Yi-1, C₁) f'(x₁) = y₁ ≈ Yı+1-yl-1 2h X1+1=Xi *Ị-XI-1

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