Definite integral

  • Thread starter s883
  • Start date
  • #1
5
0

Homework Statement


π/2
d x/
(x2 - 2x cosx + 1)
0


п
sin x. ex^2dx
-п


Homework Equations





The Attempt at a Solution


Homework Statement





Homework Equations





The Attempt at a Solution


Homework Statement





Homework Equations





The Attempt at a Solution


Homework Statement





Homework Equations





The Attempt at a Solution


Homework Statement





Homework Equations





The Attempt at a Solution


Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
196
0
What exactly are you asking?
 
  • #3
5
0
what to use to solve them - especially the second one- i've tried substitution but got me nowhere
 
  • #4
For the second one, try integration by parts. Not sure myself if it will work, but by looking at it I see two functions multiplied together. Anything like that you should think substitution or interation by parts.
 
  • #5
5
0
thanks :)
 
  • #6
SammyS
Staff Emeritus
Science Advisor
Homework Helper
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1,045
For the second one:

Isn't the integrand an even function?
 
  • #7
SammyS
Staff Emeritus
Science Advisor
Homework Helper
Gold Member
11,394
1,045
For the first one, use integration by parts for:

[tex]\int x\cos(x) dx[/tex]
 

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