Hint: look for a suitable substitution; in particular, whenever you spot an inte- grand of the form f(g(0))g'(0), the substitution u = g(0) is likely helpful. 6. Find the following indefinite integrals (anti-derivatives) using an appropriate substitut tion. (a) (2t + 1) 1.5 dt. (b) dx (Remember to use log u where appropriate). 1 - x (c) (x + 1)V2x + x2 dx