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Given 2:03 f(x) = +1, 2 + sin(1.c) that is defined over [1, 6] with a step (h= 1). Using the linear regression (curve fitting). If the data were fitted into a linear function P1(x) = a0 + a1x, then the first derivative of P1(x) is: 71.8 None of them 41.8 36.8