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    I know the Q could be done very easily, but I've just made it longer for myself. Nevertheless, I should've obtained the same answer. Having checked, I have no idea where I've made my mistake. I'm not sure if I "broke" a mathematical rule?

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    Posted from TSR Mobile
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    (Original post by ps1265A)
    I know the Q could be done very easily, but I've just made it longer for myself. Nevertheless, I should've obtained the same answer. Having checked, I have no idea where I've made my mistake. I'm not sure if I "broke" a mathematical rule?

    Name:  ImageUploadedByStudent Room1422108437.594222.jpg
Views: 71
Size:  137.2 KB
    Name:  ImageUploadedByStudent Room1422108340.741626.jpg
Views: 79
Size:  145.4 KB
    Name:  ImageUploadedByStudent Room1422108351.624483.jpg
Views: 70
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    Name:  ImageUploadedByStudent Room1422108363.859015.jpg
Views: 78
Size:  139.0 KB




    Posted from TSR Mobile
    not many people will be prepared to look at three pages of algebra (particularly of poor photo quality), however

    I did look at the question which I am going to steal it as it is very good (for this I thank you)
    Your plan is not that great.
    Go back at the very start.

    look at 2sec2xtanx

    doesn't it look preety?
    why is there a 2 there?

    that might give a clue for your parts ...
    the whole solution is half a page of A4
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    (Original post by TeeEm)
    not many people will be prepared to look at three pages of algebra (particularly of poor photo quality), however

    I did look at the question which I am going to steal it as it is very good (for this I thank you)
    Your plan is not that great.
    Go back at the very start.

    look at 2sec2xtanx

    doesn't it look preety?
    why is there a 2 there?

    that might give a clue for your parts ...
    the whole solution is half a page of A4
    What's the actual question. Can't see it clearly. Want to give it a try
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    (Original post by Super199)
    What's the actual question. Can't see it clearly. Want to give it a try
    I think it is 2x2 sec2xtanx
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    (Original post by TeeEm)
    not many people will be prepared to look at three pages of algebra (particularly of poor photo quality), however

    I did look at the question which I am going to steal it as it is very good (for this I thank you)
    Your plan is not that great.
    Go back at the very start.

    look at 2sec2xtanx

    doesn't it look preety?
    why is there a 2 there?

    that might give a clue for your parts ...
    the whole solution is half a page of A4
    Ah, got it! Thankssss!


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    (Original post by ps1265A)
    Ah, got it! Thankssss!


    Posted from TSR Mobile
    Excellent!

    I hope you saw what you meant to see ...

    the "heavyweights" see d/dx(tan2x)= 2sec2xtanx

    but the super-heavyweights see that little bit extra

    how far did you see?
    (Rhetorical Question)
 
 
 
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