1. Find the absolute extremum points of f(x) = sin x + cosx on the interval [0, it] 2. Use a local linear approximation of f(x) = In x to estimate In (0.9) 1+x 1.81 3. The marginal cost of manufacturing x tarpaulins is given by 0. 03x- + 0. 4x + 7 . If the cost of making 10 tarpaulins is 150 pesos, how much does it cost to make 5 tarpaulins