1. Standard membergenius
    Wayward Soul
    Your Blackened Sky
    Joined
    12 Mar '02
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    15128
    15 Jan '05 16:23
    tricky little trig problem that i found today. that is, it was in my exam...woo...

    show that tan(3x) = (3*tan(x)-tan(x)^3)/(1-3*(tan(x)^2)
  2. omnipresent
    Joined
    29 Oct '04
    Moves
    20009
    15 Jan '05 23:31
    Originally posted by genius
    tricky little trig problem that i found today. that is, it was in my exam...woo...

    show that tan(3x) = (3*tan(x)-tan(x)^3)/(1-3*(tan(x)^2)
    wtf??? ... and I felt bad because I messed up my physics exam on thursday (that is, really messed it up as in nearly every question wrong...). Did you get the right answer in the exam, btw?
    Angie 🙄😲🙄😲🙄😲🙄😲

    PS: I hate physics... and I have a maths exam on tuesday, so I'll just ask you if I have questions beforehand 😀
  3. DonationAcolyte
    Now With Added BA
    Loughborough
    Joined
    04 Jul '02
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    3790
    16 Jan '05 00:311 edit
    Originally posted by genius
    tricky little trig problem that i found today. that is, it was in my exam...woo...

    show that tan(3x) = (3*tan(x)-tan(x)^3)/(1-3*(tan(x)^2)
    Use the formula for tan(A+B) ( (tanA + tanB)/(1-tanAtanB) or something) and turn the handle - standard Higher/A-Level question. 😴
  4. Standard membergenius
    Wayward Soul
    Your Blackened Sky
    Joined
    12 Mar '02
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    15128
    16 Jan '05 12:04
    Originally posted by Acolyte
    Use the formula for tan(A+B) ( (tanA + tanB)/(1-tanAtanB) or something) and turn the handle - standard Higher/A-Level question. 😴
    erm-i meant to add in "using De Moivres theorem". sorry 😛
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