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Find a, b parameters

  1. Oct 22, 2012 #1
    Find a, b parameters such that the function such that the function $f(x)= (sin2x)/(a-bcosx)$ has extreme value in point (pi/3,1/4)
     
  2. jcsd
  3. Oct 22, 2012 #2

    tiny-tim

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    Welcome to PF!

    Hi Fatlum! Welcome to PF! :wink:

    Show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:
     
  4. Oct 22, 2012 #3
    I understand that in this point the derivative should be 0. So I found the derivative ,equaled to zero and I replaced (pi/3=x) . But I'm not sure, should I equal the function with 1/4 to find the ordiante ?
     
  5. Oct 22, 2012 #4

    tiny-tim

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    using only sinx = π/3 will only give you the ratio a/b

    you need to use y = 1/4 to find what they actually are :smile:
     
  6. Oct 23, 2012 #5
    Thank you very much tiny-tim. I found now the paramters. a=5 and b=4.
     
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