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11/6/2012Secant Methodf f ff x = x cos x 2 e x ln 3x-fx ix = x i−1 ,f ′ x i = limx→xif x − f x ix − x if ′ x i ≈ f x i−1 − f x ix i−1 − x i= f x i − f x i−1x i − x i−1Secant Methodx i+1 = x i − f x if ′ x i = x i −-f x i= xf x i − f x i − f x i x i − x i−1i−1 f x i − f x i−1x i − x i−1x i+1 = x i − f x i x i − x i−1f x i − f x i−12 x 0 x 1x 2 x 0 , f x 0 x 1 , f x 120