Turn on thread page Beta
    • Thread Starter
    Offline

    16
    ReputationRep:
    Name:  1479163842683-1442669375.jpg
Views: 39
Size:  296.0 KB for these two questions, I don't get why the u value is set as shown . For part c why is u not cosx ?
    For part e why is u cosx not sinx ??

    Thx
    • Community Assistant
    Offline

    20
    ReputationRep:
    Community Assistant
    (Original post by coconut64)
    for these two questions, I don't get why the u value is set as shown . For part c why is u not cosx ?
    For part e why is u cosx not sinx ??

    Thx
    Because not in all cases would you be picking a substitution based on what is there. These substitutions are based off how their derivatives would help simplify what is inside the integral into something we are more comfortable integrating.
    Offline

    21
    You could probably use sin but the given substitution is normally there to make life easier.
 
 
 
Reply
Submit reply
Turn on thread page Beta
Updated: November 15, 2016

University open days

  • University of East Anglia
    All Departments Open 13:00-17:00. Find out more about our diverse range of subject areas and career progression in the Arts & Humanities, Social Sciences, Medicine & Health Sciences, and the Sciences. Postgraduate
    Wed, 30 Jan '19
  • Solent University
    Careers in maritime Undergraduate
    Sat, 2 Feb '19
  • Sheffield Hallam University
    City and Collegiate Campus Undergraduate
    Sun, 3 Feb '19
Poll
The new Gillette ad. Is it:
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.