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(𝑓(𝑥𝑖−1 ) − 𝑓(𝑥𝑖))/(𝑥𝑖+1 − 𝑥𝑖−1)

(𝑓(𝑥𝑖 ) − 𝑓(𝑥𝑖−1))/(𝑥𝑖 − 𝑥𝑖+1)

(𝑓(𝑥𝑖 ) − 𝑓(𝑥𝑖−1))/(𝑥𝑖 − 𝑥𝑖−1) (correct)

(𝑓(𝑥𝑖−1 ) − 𝑓(𝑥𝑖))/(𝑥𝑖 − 𝑥𝑖−1)

(𝑓(𝑥𝑖 ) − 𝑓(𝑥𝑖−1))/(𝑥𝑖 − 𝑥𝑖−1)

(𝑓(𝑥𝑖−1 ) − 𝑓(𝑥𝑖))

(𝑓(𝑥𝑖 ) − 𝑓(𝑥𝑖−1)) (correct)

(𝑓(𝑥𝑖−1 ) − 𝑓(𝑥𝑖))/(𝑥𝑖+1 − 𝑥𝑖−1)