Hey there! Sign in to join this conversationNew here? Join for free
    • Political Ambassador
    Offline

    3
    ReputationRep:
    Political Ambassador
    (Original post by Voyageuse)
    So you can do part a). For b), use the bit you've worked out as the integral. But you need to change the limits, as the limits give in the question are for an integral in terms of x. To change the limits, put each limit into the substitution equation...
    a) u=e^x +1, u=e^1 +1 and u=e^0 +1, so the new limits are u=e+1 and u=1
    b) x=sin^2(theta), 1=sin^2(theta) and 0=sin^2(theta), sin(theta)=1 and sin(theta)=0, so the new limits are 90 and 0.
    Put the new limits into your equation from part one and then integrate as usual
    You need to work in radians
    Offline

    11
    ReputationRep:
    (Original post by advice_guru)
    Are you doing A levels now?
    yes I am
    (Original post by advice_guru)
    lol the top question.
    Lol, they're both 6ii)
    And again, because its a definite integral, if you use a substitution and if you change the limits you get the same value, you don't need to replace the x's in.
    Offline

    0
    ReputationRep:
    (Original post by joostan)
    yes I am

    Lol, they're both 6ii)
    And again, because its a definite integral, if you use a substitution and if you change the limits you get the same value, you don't need to replace the x's in.
    See that is the thing, I barely remember my first year maths degree, so this stuff is pretty foreign to me unless I read over it.

    Like If I did C4 now, I would probably fail miserably. I vaguely remember vectors being a pain in the arse in C4, and the messed up "let's integrate everything in the world" bit at the end.
    Offline

    11
    ReputationRep:
    (Original post by advice_guru)
    See that is the thing, I barely remember my first year maths degree, so this stuff is pretty foreign to me unless I read over it.

    Like If I did C4 now, I would probably fail miserably. I vaguely remember vectors being a pain in the arse in C4, and the messed up "let's integrate everything in the world" bit at the end.
    Yeah, though the number of marks you get for vectors is literally disgusting, there's 14 marks on it in some papers
    Offline

    0
    ReputationRep:
    (Original post by joostan)
    Yeah, though the number of marks you get for vectors is literally disgusting, there's 14 marks on it in some papers
    Wow, lol.

    I find in the A2 maths exams they get very creative with the questions, so creative in fact that you cant even revise some of their tricks, it's either you see it or you dont.

    That's why I like university maths, its more straightforward, none of this trying to trick you business. The lecturer writes the notes, he writes the tutorials, he writes the coursework, he writes the exam and he marks it.
    THAT'S HOW IT SHOULD BE
    Offline

    11
    ReputationRep:
    (Original post by advice_guru)
    Wow, lol.

    I find in the A2 maths exams they get very creative with the questions, so creative in fact that you cant even revise some of their tricks, it's either you see it or you dont.

    That's why I like university maths, its more straightforward, none of this trying to trick you business. The lecturer writes the notes, he writes the tutorials, he writes the coursework, he writes the exam and he marks it.
    THAT'S HOW IT SHOULD BE
    Where do you study?
    Offline

    0
    ReputationRep:
    (Original post by joostan)
    Where do you study?
    It's a university in London.
    I would tell you more, but I'd rather remain vaguely anonymous on here.

    It is a pretty good university though.
    Offline

    11
    ReputationRep:
    (Original post by advice_guru)
    It's a university in London.
    I would tell you more, but I'd rather remain vaguely anonymous on here.

    It is a pretty good university though.
    fair enough, no worries
 
 
 
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • Poll
    Has a teacher ever helped you cheat?
    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
  • See more of what you like on The Student Room

    You can personalise what you see on TSR. Tell us a little about yourself to get started.

  • 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.