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C3 I.Y.G.B paper a help Watch

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    (Original post by TeeEm)
    obvious "cheating" among the boards
    you can do triple maths and you will never see or tested on this
    An interesting question is always "what is the single transformation that's maps the curve y=f(2x) to y=f(2x+2).
    Everyone says translation by vector  \begin{pmatrix} -2 \\ 0 \end{pmatrix} :laugh:
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    (Original post by B_9710)
    An interesting question is always "what is the single transformation that's maps the curve y=f(2x) to y=f(2x+2).
    Everyone says translation by vector  \begin{pmatrix} -2 \\ 0 \end{pmatrix} :laugh:
    Yes,
    they will not give that either ...
    Even more interesting is to give it in context of equations
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    (Original post by TeeEm)
    16 what?
    toy soldiers?
    £16K, my time is worth a lot of money
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    (Original post by anonwinner)
    £16K, my time is worth a lot of money
    cheque is in the post ...
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    (Original post by TeeEm)
    cheque is in the post ...
    Could something like Question 7 on this paper (http://www.madasmaths.com/archive/iy...apers/c3_b.pdf) come up in an Edexcel C3 exam? I always mess these questions up and examsolutions doesn't have any tutorials on them
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    (Original post by anonwinner)
    Could something like Question 7 on this paper (http://www.madasmaths.com/archive/iy...apers/c3_b.pdf) come up in an Edexcel C3 exam? I always mess these questions up and examsolutions doesn't have any tutorials on them
    this type of question has not come up in EDEXCEL for a long time but it is definitely on the syllabus
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    (Original post by TeeEm)
    this type of question has not come up in EDEXCEL for a long time but it is definitely on the syllabus
    Okay thanks.

    Is there a name for this type of question so I can look up a guide or something?
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    (Original post by anonwinner)
    Okay thanks.

    Is there a name for this type of question so I can look up a guide or something?
    no name ... just an application of the compound angle formulae
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    (Original post by TeeEm)
    no name ... just an application of the compound angle formulae
    These questions confuse me.

    For example, it says A is obtuse, but if sinA=12/13 then surely A can't be obtuse? Because solving this gets A=67.4 degrees and A=112.6 degrees
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    (Original post by anonwinner)
    These questions confuse me.

    For example, it says A is obtuse, but if sinA=12/13 then surely A can't be obtuse? Because solving this gets A=67.4 degrees and A=112.6 degrees
    there is no solving
    look at the solution
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    (Original post by TeeEm)
    there is no solving
    look at the solution
    Sorry I am not explaining very well what I mean.

    "sin A = 12/13" has no solution if A is obtuse. If you try to find "cos A" from "sin A = 12/13" then you get "cos A = 5/13". "cos A = 5/13" also has no solution if A is obtuse.

    But "cos A = -5/13" does have a solution, so you use this to find "sin (A+B)".

    I am asking: why do you change "cos A = 5/13" to "cos A = -5/13", but not "sin A = 12/13" to "sin A = -12/13".
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    (Original post by anonwinner)

    "sin A = 12/13" has no solution if A is obtuse.
    Are you sure?
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    (Original post by TeeEm)
    Are you sure?
    wow i am dumb ffs.
 
 
 
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