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    Hi guys.
    I am retaking C1 to get more UMS.
    Anyway, my question is in C4 we have learnt implicit differentiation. Can I use that in C1?

    E.g. a circle equation and i use a c4 method and get the right answer, will I get full marks?

    Thanks.
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    (Original post by seizetoday)
    Hi guys.
    I am retaking C1 to get more UMS.
    Anyway, my question is in C4 we have learnt implicit differentiation. Can I use that in C1?

    E.g. a circle equation and i use a c4 method and get the right answer, will I get full marks?

    Thanks.
    You unfortunately have to use core 1 techniques.

    I know it sucks. I've learnt most of Core 3 and Core 4 early and so for example, the questions on using the trapezium rule I can integrate without using the trapezium rule but you still have to use the trapezium rule.
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    (Original post by WillWalker23)
    You unfortunately have to use core 1 techniques.

    I know it sucks. I've learnt most of Core 3 and Core 4 early and so for example, the questions on using the trapezium rule I can integrate without using the trapezium rule but you still have to use the trapezium rule.
    Hi, thanjs for your reply. That does suck indeed. Like I could use the product rule rather than expanding it out etc. Sucks
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    (Original post by seizetoday)
    Hi guys.
    I am retaking C1 to get more UMS.
    Anyway, my question is in C4 we have learnt implicit differentiation. Can I use that in C1?

    E.g. a circle equation and i use a c4 method and get the right answer, will I get full marks?

    Thanks.
    Wait why would you need to use implicit differentiation? Care to give an example?
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    (Original post by seizetoday)
    Hi guys.
    I am retaking C1 to get more UMS.
    Anyway, my question is in C4 we have learnt implicit differentiation. Can I use that in C1?

    E.g. a circle equation and i use a c4 method and get the right answer, will I get full marks?

    Thanks.
    You won't get the method mark, because you are not supposed to know it for C1.
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    (Original post by Super199)
    Wait why would you need to use implicit differentiation? Care to give an example?
    Sure. Off the top of my head, say an equation of a circle is x^2 + y^2 +8x +5y +3=0 or something. You know the radius and centre and the point it goes through and the q asks for you to find the equation of the tangent. At c1 they expect you to find the change in y/change in x i.e. the gradient and then x -1 since it is the normal. And then do the usual business with the point it goes through e.g. y-y1=m(x-x1). Anyway, implicit differentiation means u can differentiate the circle equation and plug x and y to find gradient.
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    (Original post by kkboyk)
    You won't get the method mark, because you are not supposed to know it for C1.
    Sucks.
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    (Original post by seizetoday)
    Hi guys.
    I am retaking C1 to get more UMS.
    Anyway, my question is in C4 we have learnt implicit differentiation. Can I use that in C1?

    E.g. a circle equation and i use a c4 method and get the right answer, will I get full marks?

    Thanks.
    You should get the marks. However if you make an error you wont get any method marks. It states clearly that if the correct answer is obtained using a different method than stated award full marks, however if this different method fails, only award working marks to those that pertain to the wanted method. An example is that you can use the cross product from FP3 in C4 for vector questions and you will still get full marks, however if you make a mistake you will likely get 0.
 
 
 

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