I need help on these 4 math problems:

Use integration by parts to find the definite integral. (Express numbers in exact form. Use symbolic notation and fractions where needed.) */12 x tan?(3x) dx = 0Use integration by parts to find the given definite integral. (Express numbers in exact form. Use symbolic notation and fractions where needed.) . 2x e cos (x) dx = AIFind the area A of the region enclosed by the graphs of f(x) = 16x In (x) and g(x] = 4x2 111 (x) for x 3 1. (Use symbolic notation and fractions where needed.) A Find the area under the graph of y = xe** from x = 0 to x = 2. (Express numbers in exact form. Use symbolic notation and fractions where needed.) area under the graph