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  1. FinalFantasy

    trig

    oh with that first question... i just realised i just did lots of stuff and its not wat im meant to do... hehehe
  2. FinalFantasy

    trig

    1. cot(A+B)=cos(A+B)\sin(A+B)=[cosAcosB-sinAsinB]\[sinAcosB+cosAsinB] 1\tan(A+B)=(1-tanAtanB)\(tanA+tanB) =(cosAcosB-sinAsinB)\(sinAcosB+sinBcosA) 2.(1-cosA)\(1+cosA)=(1-[1-2sin(A\2)])\(1+2cos(A\2)-1) =tan(A\2)
  3. FinalFantasy

    2005 CSSA - Q2(e)

    no The message you have entered is too short. Please lengthen your message to at least 10 characters.
  4. FinalFantasy

    hardest 4u topic

    ^yeap i agree physics now is juz memorise chunks of info, won't help ya in maths at all!
  5. FinalFantasy

    Completely blown my chance of 95?

    u still got a good chance! especially if ur ranks are good and subjects are good
  6. FinalFantasy

    Band 6

    yea as long as ur rank is still fine... and the ppl better ranked than u do good in da HSC as wel as u
  7. FinalFantasy

    Geostationary satellite

    ^oh u made a new name lol silly me -_-
  8. FinalFantasy

    Geostationary satellite

    wait... u r confusing me!! so r u the son of that Buchanan on the extension 2 maths forum? and also, before it says u have 4 posts but ur latter post, it says "Tobes New Member Join Date: Nov 2004 Posts: 1" howcome before it was 4 post and now it is 1 post? u didn't seem to...
  9. FinalFantasy

    Geostationary satellite

    ooer so ur Buchanan's son or something? I am not "leung" if you were referring to me...
  10. FinalFantasy

    Geostationary satellite

    hey Toby, are you related to the Buchanan at the Extension 2 Mathematics forum?
  11. FinalFantasy

    something new on the "pi and e" debate...

    it's too good to not steal ;)
  12. FinalFantasy

    something new on the "pi and e" debate...

    hahaha but i like Hong Kong!!! and so ur chinese eh? can read my HK:p
  13. FinalFantasy

    complex numbers question

    hihi! (cosθ+isinθ)/(cosØ+isinØ) =(cosθ+isinθ)/(cosØ+isinØ) * (cosØ-isinØ)\(cosØ-isinØ) =(cosθcosØ-isinØcosθ+isinθcosØ+sinθsinØ)\(cos²Ø+sin²Ø) =(cosθcosØ-isinØcosθ+isinθcosØ+sinθsinØ) =cos(θ-Ø)+isin(θ-Ø)
  14. FinalFantasy

    something new on the "pi and e" debate...

    wow, first time I see someone here with Chinese username! I'm gonna try make one too!
  15. FinalFantasy

    2 simple harmonic motion

    ^ ur rite! omg i've been sooo stupid lately, sooo many silly things i do....:(
  16. FinalFantasy

    2 simple harmonic motion

    "10 complete oscillations per minute" so one 10 oscillations per 60 seconds 10\60 oscillations per second so period, T=1\6=2pi\n .: n=12pi let x=asin 12pit v=12pia cos 12pit "its max speed is 5m/s." .: 12pi a=5 a=5\12pi .: half amplitude=5\24pi at x=a, t=1\24 at x=5\24pi...
  17. FinalFantasy

    2 simple harmonic motion

    1. let x=asin nt v=ancos nt 4\a=sin nt 6\an=cos nt 16\a²+36\a²n²=1 16+36\n²=a² 3\a=sin nt 8\an=cos nt 9\a²+81\a²n²=1 9+81\n²=a² so 16+36\n²=9+81\n² 45\n²=7 n²=45\7 n=sqrt (45\7) T=2pi\n sub n back into one of dem to find a den "acceleration when at its greatest distance...
  18. FinalFantasy

    Maths help

    there's enuff time if u juz do 2unit just grab a simple book, like maths in focus den get the basics den start doing past papers gogogo! there's enuff time!!!
  19. FinalFantasy

    Subsstitution Question

    ^ numerator: n+2-n-1=1 denominator: (n+1)(n+2) so it's 1\(n+1)(n+2) if it's numerator u dun need to "make the bttom the same" u do it for the denominator does dat ans. ur q?
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