AQA Core 4 Jan 2013 Q3

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AQA Core 4 January 2013 exam paper on trigonometric identities including addition formulae and double angle forumlae
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Oops! Well spotted! That is what I meant. I have added a note to clarify this..

mathedup
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Just to confirm something... For a)(ii) - if we were to find the maximum value, would it be 1 rather than -1?

NurAlayat