Turn on thread page Beta
    • Thread Starter
    Offline

    0
    ReputationRep:
    im soooo stuck on this homework. please can someone help me do it if you can >.< would be very grateful...

    1) find, exact values of integral of xlnx and then there is e on the top and 1 on the bottom of the integral...

    2) find exact values of integral of xsin0.5x, with 0.5pi on top and 0 on the bottom.
    Offline

    10
    ReputationRep:
    ∫ xlnx dx = (0.5x²)lnx - ∫ 0.5x²(1/x) dx = [(0.5x²)lnx - 0.25x²]

    ∫ xsin(0.5x) dx = -2xcos(0.5x) + ∫ 2cos(0.5x) dx = 2[-xcos(0.5x) + 2sin(0.5x)]

    And sub in the limits...
    • Thread Starter
    Offline

    0
    ReputationRep:
    ooo thank you so much lol but i still dont get the second one. was U = sin0.5x or x
    Offline

    10
    ReputationRep:
    u=x and dv/dx=sin(0.5x).
    • Thread Starter
    Offline

    0
    ReputationRep:
    okies thank you very much
 
 
 
Turn on thread page Beta
Updated: March 4, 2005

University open days

  • University of Lincoln
    Mini Open Day at the Brayford Campus Undergraduate
    Wed, 19 Dec '18
  • University of East Anglia
    UEA Mini Open Day Undergraduate
    Fri, 4 Jan '19
  • Bournemouth University
    Undergraduate Mini Open Day Undergraduate
    Wed, 9 Jan '19
Poll
Were you ever put in isolation at school?
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

Equations

Best calculators for A level Maths

Tips on which model to get

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.