1-4 Evaluate the integral using integration by parts with the indicated choices of u and du. 1. ( xe"* dx; u = x, do = ex dx 2. Vx Inxdx; u = Inx, du = \\x dx 3. x cos 4x dx; u = x, du = cos 4x dx 4. sin xdx; u = sin x, du = dx