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Find the Integer N, solution attached

  1. Jun 18, 2014 #1
    1. The problem statement, all variables and given/known data

    The expression sin(2°) sin(4°) sin(6°)... sin(90°) is equal to a number of the form (n√5)/2^50
    where "n" is an integer. Find n

    2. Relevant equations

    geometric sum: a/ 1-r


    3. The attempt at a solution

    I found the solution online but have no idea how they got it... been going back and forth trying to figure it out on my own but I don't understand. Any help would be appreciated everyone. Thanks!
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     

    Attached Files:

  2. jcsd
  3. Jun 18, 2014 #2

    Simon Bridge

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    2016 Award

    Never mind the online solution
    How would you go about finding the answer?
    You need to be able to use the geometric sum stuff - so you need to be able to change the product of sines into a sum of something - there are not many different ways to do this.
     
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