Results 1 to 6 of 6

Thread: Is this a bad habit?

  1. #1
    Junior Member HeroWise's Avatar
    Join Date
    Dec 2017
    HSC
    N/A
    Gender
    Male
    Location
    01001110 01100101 01110111 00100000 01010011 01101111 01110101 01110100 01101000 00100000 01010111 01100001 01101100 01100101 01110011
    Posts
    218
    Rep Power
    1

    Is this a bad habit?

    I have read that Delta x on Delta y is different to dx/dy

    But im SOOO used to delta x/ delta y that when i do any questions i put it in. Is this technically wrong? or should i try to change this habit?

  2. #2
    Loquacious One
    Join Date
    Feb 2009
    HSC
    N/A
    Gender
    Male
    Posts
    3,754
    Rep Power
    10

    Re: Is this a bad habit?

    Didn't I already point out to you a few months ago that the 2 things are distinct. It is not just your bad habit (few people have this "habit") but it is simply incorrect.

    And stop using delta y/delta x when you mean't dy/dx. Maybe most teachers and markers would overlook the difference; result is you think they are the same thing.
    Last edited by Drongoski; 21 Jun 2018 at 9:35 PM.
    1-on-1 Maths Tutoring(IB & HSC): Epping, Beecroft, Eastwood, Carlingford & Beyond
    IB: Maths Studies, Maths SL & Maths HL; HSC: 2U, 3U & 4U
    Highly Qualified & Highly Experienced. Estimated ATAR > 9.995
    There are IB Maths Tutors and there are IB Maths Tutors.

  3. #3
    Junior Member HeroWise's Avatar
    Join Date
    Dec 2017
    HSC
    N/A
    Gender
    Male
    Location
    01001110 01100101 01110111 00100000 01010011 01101111 01110101 01110100 01101000 00100000 01010111 01100001 01101100 01100101 01110011
    Posts
    218
    Rep Power
    1

    Re: Is this a bad habit?

    i do remember u pointing it out, and thanks a lot for it again,

    but like i have heard in 4u the teacher basically forces you to use delta y on delta x

    In school we just started basic integration as we are starting year 11 prelims next term. He has done dy/dx. I have seen that his methods pf teaching are actually good and an hsc marker, he do gives the expectations and standards for the hsc.
    I addressed this because you told me off last time ahah
    Im like in an inner battle rn
    And again, when i started calculus, i used deltas so its like ingrained. need to really change it

    and again thanks Drongoski

  4. #4
    617 pages fan96's Avatar
    Join Date
    May 2017
    HSC
    2018
    Gender
    Male
    Location
    NSW
    Posts
    406
    Rep Power
    2

    Re: Is this a bad habit?

    Quote Originally Posted by HeroWise View Post
    but like i have heard in 4u the teacher basically forces you to use delta y on delta x
    Not true. If your teacher makes you do it then they are wrong.

    In particular,



    (as the Cambridge textbook states when introducing the derivative)

    So the two are subtly different things - is a change in , but is specifically an infinitesimal change in .
    Last edited by fan96; 21 Jun 2018 at 11:49 PM.
    HSC 2018: [English Adv.] • [Maths Ext. 1] • [Maths Ext. 2] • [Chemistry] • [Software Design]

    Goal: ≥92.00 for B Advanced Mathematics (Hons) / B Engineering (Hons) (Computer) at UNSW

  5. #5
    Loquacious One
    Join Date
    Feb 2009
    HSC
    N/A
    Gender
    Male
    Posts
    3,754
    Rep Power
    10

    Re: Is this a bad habit?

    Quote Originally Posted by HeroWise View Post
    i do remember u pointing it out, and thanks a lot for it again,

    but like i have heard in 4u the teacher basically forces you to use delta y on delta x

    In school we just started basic integration as we are starting year 11 prelims next term. He has done dy/dx. I have seen that his methods pf teaching are actually good and an hsc marker, he do gives the expectations and standards for the hsc.
    I addressed this because you told me off last time ahah
    Im like in an inner battle rn
    And again, when i started calculus, i used deltas so its like ingrained. need to really change it

    and again thanks Drongoski .
    Please report such teachers to me for a public dressing-down.
    Last edited by Drongoski; 22 Jun 2018 at 4:09 PM.
    1-on-1 Maths Tutoring(IB & HSC): Epping, Beecroft, Eastwood, Carlingford & Beyond
    IB: Maths Studies, Maths SL & Maths HL; HSC: 2U, 3U & 4U
    Highly Qualified & Highly Experienced. Estimated ATAR > 9.995
    There are IB Maths Tutors and there are IB Maths Tutors.

  6. #6
    Loquacious One
    Join Date
    Feb 2009
    HSC
    N/A
    Gender
    Male
    Posts
    3,754
    Rep Power
    10

    Re: Is this a bad habit?

    Quote Originally Posted by fan96 View Post
    Not true. If your teacher makes you do it then they are wrong.

    In particular,



    (as the Cambridge textbook states when introducing the derivative)

    So the two are subtly different things - is a change in , but is specifically an infinitesimal change in .
    What is "infinitesimal" (used a lot in textbooks in the 50's and prior) and how does it help clarify things? dy/dx is just the notation for the limit when this limit exists. This limit you now call the "derivative"; at one time it was also called the "differential coefficient"
    Last edited by Drongoski; 22 Jun 2018 at 10:00 AM.
    1-on-1 Maths Tutoring(IB & HSC): Epping, Beecroft, Eastwood, Carlingford & Beyond
    IB: Maths Studies, Maths SL & Maths HL; HSC: 2U, 3U & 4U
    Highly Qualified & Highly Experienced. Estimated ATAR > 9.995
    There are IB Maths Tutors and there are IB Maths Tutors.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •