5 A complex function can be modelled by the equation: y = cos(x3) 3x2 Find the indefinite integral of the function (f cos(x3)3x3 dx) using a substitution method. 6 The acceleration of an object moving in a strange way has been modelled as a = e*x. a) Use integration by parts to find an equation to model the velocity v if v = fe*xdx. b) Is the problem any different if you find v = [ xe* dx