Help for this limit ?

  • Thread starter erogol
  • Start date
14
0
lim x [tex]\int cost / t^2[/tex] (integral x to 1) x goes infitine
 

CompuChip

Science Advisor
Homework Helper
4,284
47
Did you mean:
[tex]\lim_{x \to \infty} \int_x^1 \frac{\cos t}{t^2} \, dt[/tex]
?
 
14
0
yes:) but there is a x before the integral
 

MathematicalPhysicist

Gold Member
4,088
134
Hint: t is in [x,1] i.e 1/t^2 is in [1,1/x^2].
 
integrate via parts and keep track of your signs
 

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