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  1. C

    trig identities

    thx treb
  2. C

    trig identities

    sup guys how do u prove this other than expanding everything, i tried contracting it but it didnt work out well for me :/ sin(5x) + sin(3x) - 2sin(2x)cos(x)=2sin(2x)cos(3x) thanks
  3. C

    Trig Function help!

    oh kk thanks for pointing out my mistake :)
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    Trig Function help!

    $From the diagram, diameter of sun$\ =149000000\times {tan31}' \\ \pi = 180^{\circ}\\\\1^{\circ}= \frac{\pi}{180}\\\therefore {60}'=\frac{\pi}{180}\\\\{1}'= \frac{\pi}{60 \times 180}\\\\\therefore {31}'= \frac{31\pi}{10800}\\\\$when x is very small,$\ tanx\approx x \\\therefore diameter =...
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    Sydney grammar/ north sydney boys year 11 entrance exam

    heres an extra post to derail op's thread
  7. C

    Selective Schools application

    yea i did it last year and got in, it wasnt particularly hard, but the maths test for that year was weird cos most of the questions didnt directly relate to maths, sorta like science. for eng writing they gave us 2 pics and told us to write our stories based on them oh yea and we also had to...
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    Selective Schools application

    yea but u can assume that 20% of the 100 applicants will go to other schools so the actual total applicants can be limited down to around 80 and since u gotta be the top 20 to make it in, u just need to be in the top 33% of the applicants so it's not as bad as it seems to be last years giras...
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    Selective Schools application

    for girra u just do a test if u do well in the test and rank in the top 20's ur pretty much in
  10. C

    NERDS PIP interview

    http://community.boredofstudies.org/member.php?u=1610923497
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