Turn on thread page Beta
    • Thread Starter
    Offline

    9
    ReputationRep:
    hey guys im stuck on these two questions and really need help
    find the following indefinite integrals
    1) e^2x arcsin(e^x) dx
    2) (x^2)/(1+x^2)
    Offline

    15
    ReputationRep:
    x^2/(1 + x^2) = (1 + x^2 - 1)/(1 + x^2) = 1 - 1/(1+x^2)
    Offline

    14
    (1) Start with integration by parts.
    Offline

    18
    ReputationRep:
    1) Substitute e^x = sin(u)
    • Thread Starter
    Offline

    9
    ReputationRep:
    yusufu how did you get from
    x^2/(1 + x^2) = (1 + x^2 - 1)/(1 + x^2)
    Offline

    13
    ReputationRep:
    What does 1 + x^2 -1 equal ?
    • Thread Starter
    Offline

    9
    ReputationRep:
    x^2, sorry stupid question but then how would i integrate 1/(1+x^2)?
    • Thread Starter
    Offline

    9
    ReputationRep:
    is it ok if anyone could help me on question 1 pls?
    Offline

    15
    ReputationRep:
    substitute tanx = u
    • Thread Starter
    Offline

    9
    ReputationRep:
    ive done that but am not getting it, is it ok if you could show me how to do it as i maybe doing it wrong, thanks
    Offline

    13
    ReputationRep:
    Post your working and then we can see where you're going wrong.
    • Thread Starter
    Offline

    9
    ReputationRep:
    im not too sure how to use tan x for the substitution and thats why i dont know how to do it, so is it possible if you could show me how to do it, thanks
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: November 16, 2008

3,277

students online now

800,000+

Exam discussions

Find your exam discussion here

Poll
Should universities take a stronger line on drugs?
Useful resources

Make your revision easier

Maths

Maths Forum posting guidelines

Not sure where to post? Read the updated guidelines here

Equations

How to use LaTex

Writing equations the easy way

Student revising

Study habits of A* students

Top tips from students who have already aced their exams

Study Planner

Create your own Study Planner

Never miss a deadline again

Polling station sign

Thinking about a maths degree?

Chat with other maths applicants

Can you help? Study help unanswered threads

Groups associated with this forum:

View associated groups

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

Write a reply...
Reply
Hide
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.