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How to limit

  1. Dec 8, 2014 #1
    • Member warned about posting homework with no effort
    1. The problem statement, all variables and given/known data

    I have a problem, I don't know how to find the limit (cos(Pi/2x))^2x when x is ∞

    2. Relevant equations

    (1+(1/x))^(1/x)=e
    3. The attempt at a solution
    I have been looking for solutions on the internet, but most of these just tend to be for fractions, I don't know how to operate with a cosine.
    Any help?
     
  2. jcsd
  3. Dec 8, 2014 #2

    jedishrfu

    Staff: Mentor

    Have you tried inserting numbers like x as 1,10,100... To see how the formula trends that might give you an idea of what happens as x gets larger?

    Do you know the value of cos(0) or cos(PI/2) ?

    You need to show us some work before we can help further.
     
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