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  1. C

    Help with random 3U questions!

    ii ) I will use algebraic method in approaching this question 1. you can make two equations y = tx + t y^2 + x^2 = 1 Hence solving simultaneously x = (1-t^2)/(1+t^2) hence subing this to linear equation y = (2t/(1+t^2)) iii) hence tan (A) = y/x = (2t/(1-t^2)) iv) using circle...
  2. C

    Help with random 3U questions!

    2 i) with this question draw a diagram to assist you in understanding the question Note that the line should intersect the circle in the FIRST QUANDRANT ie maximum t = when P lies on (0,1) hence 0 < t < 1 (greater or equal sign)
  3. C

    Help with random 3U questions!

    Q1 (a+b)^n + (a-b)^n note that their is (-) sign hence if you put them in general form you should see that every second tern ie for r= odd, the term cancels each other. Whereas for r= even ,they add up Hence = 2 (C0 a^n + C2 a^(n-2)b^2 + C4 a^(n-4) b^4 + ..... ) the last tern depends on...
  4. C

    Logarithm Questions

    2) note that 5^3 = 125 5^2 = 25 hence log(125) + log(25) + log(5) = 6log 5
  5. C

    Trials...

    Trials...
  6. C

    Difficult general solution

    General solution. You can refer to your 3u textbook Youknow about A S T C right?? First if cos(x) =cos a For example cos x = .5 = cos60 Hence x= 60, 360-60, 360+ 60, 360 + (360-60),.... Hence similarly x = a, 360-a, 360+a, 720-a ... X= 2pi*k +or - a
  7. C

    Curve Sketching help!!

    Go through hsc papers in coroneos and see the worked out solutions. Then try similar questions until you master each type of the graphs :)
  8. C

    Polynomial query

    Ummm I did say that it didn't work following on what I had said However so there is no solution?
  9. C

    Polynomial query

    oh wait you gotta to take in fact that not all 3 solutions satisfy the equation shit... i dunno anyone
  10. C

    Polynomial query

    roots are integers, let the roots be (a,b,c,d) since a*b*c*d = 1 hence roots are 1,1,1,1 or -1-1,1,1 or -1,-1,-1,-1 -k = 1+1+1+1, -1+-1+1+1 or -1+-1+-1+-1 hence k = +4,-4 or 0?
  11. C

    Polynomial query

    whats the answer? i ve got +4, -4 or 0 i am not sure though
  12. C

    Will marks get deducted for not drawing the diagram in circle geo questions?

    nope unless there was a specific question asking you to draw one,
  13. C

    perms and combs Q

    OH... i did not see that.. in that case i think you re right 56 it is.:)
  14. C

    perms and combs Q

    the working is : firstly you have to know that any number is divisble by 3 if all digits sum to be divisble by 3 ie (12132) is divisble by 3 because 1+2+1+3+2 = 9 divisble by 3. Now by T AND E for 4 digit values (3,1,8,9) , and (3,5,1,9) their sums are divisble by 3 the numbers are less...
  15. C

    perms and combs Q

    really? i ve got 50 anyone?
  16. C

    Year 11 Difficulty?

    4unit = 30% of talent + 70% of dedication Doable as long as you consistently dedicate your time on maths
  17. C

    Engineering help!

    If you work as an electrical engineering for long time and become like lets say designe or principle engineer what task would i be doing? Do you do a lot of difficult maths as an electrical engineer after uni?
  18. C

    Engineering help!

    Cheers brent :)
  19. C

    Engineering help!

    I was thinking about doing medicine, but i want to have some flexibility in my life, i don't want to work 70hours a week medicine is a good career but engineering suits me more i think
  20. C

    Engineering help!

    which university is better for engineering degree - University of Melbourne or UNSW? based on aspects of- salary, social life, cost of living, internation opportunity, faculty standards, etc (i know that UoM offers better accreditations after the master course: Eurace, Engineer Australia...
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