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Help for this limit ?

  1. Mar 27, 2009 #1
    lim x [tex]\int cost / t^2[/tex] (integral x to 1) x goes infitine
     
  2. jcsd
  3. Mar 28, 2009 #2

    CompuChip

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    Did you mean:
    [tex]\lim_{x \to \infty} \int_x^1 \frac{\cos t}{t^2} \, dt[/tex]
    ?
     
  4. Mar 28, 2009 #3
    yes:) but there is a x before the integral
     
  5. Mar 28, 2009 #4

    MathematicalPhysicist

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    Gold Member

    Hint: t is in [x,1] i.e 1/t^2 is in [1,1/x^2].
     
  6. Mar 28, 2009 #5
    integrate via parts and keep track of your signs
     
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