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    I'm doing June 2011 C3 OCR past paper, and on question 9 part 1 I just expanded it instead of using identities, don't know why, but i still technically got what they were asking, but I don;t know if it's actually possible to do that..
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    (Original post by abiantoinette)
    I'm doing June 2011 C3 OCR past paper, and on question 9 part 1 I just expanded it instead of using identities, don't know why, but i still technically got what they were asking, but I don;t know if it's actually possible to do that..
    Of course it is. Why wouldn't it be?
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    (Original post by abiantoinette)
    I'm doing June 2011 C3 OCR past paper, and on question 9 part 1 I just expanded it instead of using identities, don't know why, but i still technically got what they were asking, but I don;t know if it's actually possible to do that..

    If you mean that you wrote sin(a+b) = sin a + sin b, you were just lucky with this question. Unfortunately what I wrote isn't true and you should have used identities.

    You wouldn't have got any marks for doing it using what I wrote.
 
 
 
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