use the substitution u=2+ln(x) to show that int(e,1(ln(x)/x(2+ln(x)^2))dx)=p+ln(q) , where p and q are rational numbers.

So u=2+lnx, therefore du/dx=1/x , we can work out the new upper and new lower limit by substitute in e and 1 into 2+lnx , and we get 2+ln(e)=3 , 2+ln(1)=2Rearrange the differential we get dx=xdu , substitute u and dx and the equation becomes xln(x)/x(u)^2 , top and bottom xs cancel and with the top being ln(x) and u=2+ln(x) , we can also substitute the top with u-2 .we can now intergrate this as (u-2)/(u^2)with the limits being 3 and 2.we get a result of lnu+(2/u) , substitute in 3 and 2 and the final result is -1/3+ln(3/2).

Answered by Maths tutor

4663 Views

See similar Maths A Level tutors

Related Maths A Level answers

All answers ▸

A cuboid has a rectangular cross section where the length of the rectangle is equal to twice its width x cm. THe volume is 81 cm^3. a) show that the total length L cm of the cuboid is given by L=12x+162/x^2


If y=3x^3e^x; find dy/dx?


State the trigonometric identities for sin2x, cos2x and tan2x


a circle c has the equation x^2 + y^2 -4x + 10y = k. find the center of te circle


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences