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lilsis76

  • 2 years ago

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

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  1. lilsis76
    • 2 years ago
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    @anikay think u can help me with this one?

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

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

  4. lilsis76
    • 2 years ago
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    @anikay

  5. anikay
    • 2 years ago
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    ok, so, what would 12 be? then?

  6. lilsis76
    • 2 years ago
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    let me draw it reallyfast

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

  8. lilsis76
    • 2 years ago
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    ugh. i forgot it :/

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

  10. lilsis76
    • 2 years ago
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    hold on im looking up the formula

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

  12. lilsis76
    • 2 years ago
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    right? @anikay

  13. anikay
    • 2 years ago
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    awww D: no that's double angle

  14. lilsis76
    • 2 years ago
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    okay hold on let me check again

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

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

  17. anikay
    • 2 years ago
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    uh, here

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

  19. anikay
    • 2 years ago
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    meh tryin to hit multiple problems

  20. lilsis76
    • 2 years ago
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    haha thank you

  21. anikay
    • 2 years ago
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    ok so its

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

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

  24. anikay
    • 2 years ago
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    uh....im tired xD

  25. anikay
    • 2 years ago
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    imma go with no

  26. anikay
    • 2 years ago
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    imma say plug in 150

  27. lilsis76
    • 2 years ago
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    okay :/ then ill skip it

  28. lilsis76
    • 2 years ago
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    why 150?

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

  30. lilsis76
    • 2 years ago
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    haha where is the 17 pi coming froM?!

  31. anikay
    • 2 years ago
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    isn't that your original problem?

  32. anikay
    • 2 years ago
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    but multiplied by 2?

  33. lilsis76
    • 2 years ago
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    IT IS!!! haha i finally saw it haha

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

  35. anikay
    • 2 years ago
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    yesh?

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

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