15. Given the data shown, compute for the value of y' of 20° using Newton backward difference method. 15 30 45 75 8(in degree): 0 sin 8: 60 0.866025 90 1 0 0.258819 0.5 0.70710 0.965926 a. 0.939693 b. 0.889988 c. 0.789987 d. 0.890021

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