In (53) e 6x In order to evaluate dx, a u-substitution is employed so that the resulting integral becomes 12x 25 + e In (5) 6 In (545) B e 6x dx =k 25 + e 12x du. 1+u? In (5) Use this information to answer parts (a)-(d). (a) Find u and du for the above substitution. ..... (b) Find the constant k. and du = u= (c) Find the limits of integration A and B. k= (d) Evaluate the integral. and B=| A = In (545) 6x dx 25+ e 12x In (5)