 solution for the first one. This cos theta d theta becomes theta square cos theta sin theta plus 2 theta cos theta minus 2 sin theta plus c. This is a capital of one also in a given so theta sin will start taking some special integral d theta. So, when we substitute x square plus a square a square c ket cube theta into c square theta. Now tan theta is x. So, what is c theta then? I am going to substitute this over here. Here is this middle part into tan theta with x again same thing over here of 1 plus x square by a. So, it cancels it. Here I will interrupt your final answer. Can you also show the non-substitution method? Non-substitution method. Good. By the way of x or c ket theta. You can do it by integration by parts. Ok. So, without substitution if you want I do it. Without substitution we have to write this integral into 1. Since there is an x. Since there is a. In this part I will take this as u and take this as v. Integral infinity power x is infinity power x. Copy the same term below. I will tell you this is function.