please help 1, 3 show work please and thank you in advance

this is Calculos

1-6 - (a) Find the intervals on which f is increasing or decreasing. (b) Find the local maximum and minimum values of f. (c) Find the intervals of concavity and the inflection points. 1. f(x) = 2x} + 3x2 36x 2. f(x) = 4x3 + 3x2 - 6x + 1 + 3x + 1 3. f(x) = x4 2x + 3 - X 4. f(x) = x + 1 5. f(x) = sin x + cos x, 0