Tutorial Exercise Evaluate the indefinite integral. cos(1/x44) - dx x45 Step 1 We must decide what to choose for u. If u = f(x), then du = f'(x) dx, and so it is helpful to look for some expression for which the derivative is also present, though perhaps missing a constant factor. We can re-write cos( 749 ) Ox = COS 45 dx. 45 X 1 We see that is 44 - is part of this integral, and the derivative of 44 44x X Submit Skip (you cannot come back)