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lilsis76

express sin(17pi/12) in terms of rational numbers and radicals. how can i do this :/

  • one year ago
  • one year ago

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  1. lilsis76
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    @anikay think u can help me with this one?

    • one year ago
  2. anikay
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    remember what I said about pi/6?

    • one year ago
  3. lilsis76
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    er.....hold on, u said....pi//6 is 30 deg.

    • one year ago
  4. lilsis76
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    @anikay

    • one year ago
  5. anikay
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    ok, so, what would 12 be? then?

    • one year ago
  6. lilsis76
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    let me draw it reallyfast

    • one year ago
  7. anikay
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    you're going to need to know your half angle formulas for this

    • one year ago
  8. lilsis76
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    ugh. i forgot it :/

    • one year ago
  9. anikay
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    well, sucks, because it's gonna be a 75 degree reference angle :P

    • one year ago
  10. lilsis76
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    hold on im looking up the formula

    • one year ago
  11. lilsis76
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    cos(2a)=cos^2 - sine^2 = 2cos^2 - 1 = 1 -2 sin^2

    • one year ago
  12. lilsis76
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    right? @anikay

    • one year ago
  13. anikay
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    awww D: no that's double angle

    • one year ago
  14. lilsis76
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    okay hold on let me check again

    • one year ago
  15. anikay
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    at least, the cos(2a) is

    • one year ago
  16. lilsis76
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    okay i got it, sin Q = 2 sin Q/2 cos Q/2, right?

    • one year ago
  17. anikay
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    uh, here

    • one year ago
  18. lilsis76
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    haha im not good at math seriously ugh, this is horrible. im sorry if im wasting your time

    • one year ago
  19. anikay
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    meh tryin to hit multiple problems

    • one year ago
  20. lilsis76
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    haha thank you

    • one year ago
  21. anikay
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    ok so its

    • one year ago
  22. anikay
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    \[\cos ^2 \frac{ \theta }{ 2 } = \frac{ 1+\cos(\theta) }{ 2 }\]

    • one year ago
  23. lilsis76
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    hm...okay, do i ....just plug in the 17pi/12?

    • one year ago
  24. anikay
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    uh....im tired xD

    • one year ago
  25. anikay
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    imma go with no

    • one year ago
  26. anikay
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    imma say plug in 150

    • one year ago
  27. lilsis76
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    okay :/ then ill skip it

    • one year ago
  28. lilsis76
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    why 150?

    • one year ago
  29. anikay
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    cuz 150/2 = 75 xD or you could try 17pi/6

    • one year ago
  30. lilsis76
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    haha where is the 17 pi coming froM?!

    • one year ago
  31. anikay
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    isn't that your original problem?

    • one year ago
  32. anikay
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    but multiplied by 2?

    • one year ago
  33. lilsis76
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    IT IS!!! haha i finally saw it haha

    • one year ago
  34. lilsis76
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    okay i have one more problem and its my last.

    • one year ago
  35. anikay
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    yesh?

    • one year ago
  36. anikay
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    I should sleep soon.... is this a better pastime than League of Legends? xD

    • one year ago
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