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    (Original post by Zacken)
    Surely you mean \cos 2\theta = 2\cos^2 \theta - 1?
    That would be correct. I didn't the question:chaplin:
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    (Original post by RockConcert)
    Ah thank you so much, that identity (sin2x) was the key! Man I'm not going to forget that identity again..
    psstt top of page 11 in the formula book may be helpful :ninja:
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    (Original post by DylanJ42)
    psstt top of page 11 in the formula book may be helpful :ninja:

    Different exam board maybe? My page 11 is all about curvature, arc length..etc
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    (Original post by RockConcert)
    Different exam board maybe? My page 11 is all about curvature, arc length..etc
    edexcel?
 
 
 
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