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Edexcel C3 Help

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    Hi, you know the questions where it says show that so and so can be in the form RCos/Sin (theta +- Alpha). For those questions are you allowed to straight up work R and alpha out using their formulaes or do you need to prove it by expanding it and cancelling then comparing etc. On mark schemes I have seen the marks come from the formulae but I need to make sure I am not practicing wrong
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    (Original post by mahmzo)
    Hi, you know the questions where it says show that so and so can be in the form RCos/Sin (theta +- Alpha). For those questions are you allowed to straight up work R and alpha out using their formulaes or do you need to prove it by expanding it and cancelling then comparing etc. On mark schemes I have seen the marks come from the formulae but I need to make sure I am not practicing wrong
    Stick with the level of detail offered in the mark scheme.
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    There was one mark scheme which said in small writing, that the expansion must be shown, so to be sure I would stick with the expansion. It would also help you to avoid mistakes when Asinx and Bcosx are switched around.

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Updated: September 23, 2016
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