00:01
Hello everyone.
00:02
So in this question, in first part, we have to give the examples for which the u substitution is better method to be adopted than by integration by parts.
00:23
So the examples are first lnx divided by x, dx.
00:35
Here we will take u to be to be.
00:37
Lnx.
00:39
Second, cosm lnx divided by x d x.
00:53
Here we'll choose u to be again lnx.
00:59
Next, third, x divided by x squared plus 1 d x here we'll take u to be x square plus 1.
01:18
4th, 1 divided by x l n x d x where u will be again l n x and fifth is e raised to the power x divided by cosec e raised to the power x d x here will take u to be e raised to the power x now this was the solution for first part a part for b part the question says that we have to find the examples for which integration by parts is better strategy than you substitution right so first example can be x multiplied by e raised to the power x dx here we'll take u as x and dv as e raised to the power x d x right next integration x lnx dx here you will be x and dv will be lnx dx will be lnx dx next example, third, x, cos x d x, here will take u to be x and dv to be cause x dx, fourth, x divided by e -raise to the power x, here, here, u will be x, and dv will be 1 divided by e -raised to the power x, dx, here, u will be x, 2 ,000, will be 1, divided by e -raised to the power x, d x, dx, here, here, here, e raised to the power x dx...