5 thoughts on “Year 12 Extension 2 – Past Papers

  1. hey!!!

    can ne1 tell me, in inty when u use t=tanx/2, can u jus write dx=2dt/1+t^2, or du need to prove it??????

  2. You can just write dx=2dt/(1+t^2), however be careful, if you use t=tanx, then dx=dt/(1+t^2), and so on.
    Generally if you use t=tan(x/a), then dx=adt/(1+t^2).

    P.S. Work on your spelling!!!!

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