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# Is this even mathematically possible? watch

1. 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..
2. (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?
3. (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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