Integrating Problem: Definite Integral from sqrt2 to 2

  • Thread starter Thread starter miller8605
  • Start date Start date
  • Tags Tags
    Intergration
Click For Summary
SUMMARY

The discussion focuses on evaluating the definite integral of the function 1/x^3 * sqrt(x^2 - 1) from sqrt(2) to 2. The user attempts to separate the integrand into two parts, 1/x^3 and 1/sqrt(x^2 - 1), and applies trigonometric substitution for the latter. The community suggests that a single trigonometric substitution can simplify the entire integrand, indicating that the user's approach may be overly complicated. Clarification is requested on the integration of the first part, specifically the transformation of 1/x^3 to x^-3.

PREREQUISITES
  • Understanding of definite integrals and their properties
  • Knowledge of trigonometric substitution techniques in calculus
  • Familiarity with integration of rational functions
  • Basic algebraic manipulation of expressions
NEXT STEPS
  • Study trigonometric substitution methods for integrals, focusing on secant and tangent functions
  • Practice integrating rational functions, particularly those involving powers of x
  • Review the properties and techniques of definite integrals in calculus
  • Explore the simplification of integrands before integration to enhance efficiency
USEFUL FOR

Students and educators in calculus, particularly those focusing on integration techniques and trigonometric substitutions. This discussion is beneficial for anyone seeking to improve their understanding of definite integrals and integration strategies.

miller8605
Messages
17
Reaction score
0

Homework Statement


i'm taking a defitinite integral from sqrt2 to 2 of the function 1/x^3*sqrt(x^2-1)dx.

Homework Equations





The Attempt at a Solution


I separated it into 1/x^3 and 1/sqrt(x^2-1). I have the second part using trig sub. as being sec theta dtheta, before integrating it. I believe i did this part correctly.

What I can't remember is that I make 1/x^3 to x^-3 and then integrate it that way with the final being -1/2(1/x^2)??

Am i going about this correctly?
 
Physics news on Phys.org
miller8605 said:
I separated it into 1/x^3 and 1/sqrt(x^2-1).

No need to do that. The entire integrand comes out very nice with a trig substitution.

I have the second part using trig sub. as being sec theta dtheta[/color], before integrating it. I believe i did this part correctly.

The part in red[/color] makes very little sense to me, but it sounds like it has the kernel of a correct method in there. Could you elaborate?
 

Similar threads

  • · Replies 105 ·
4
Replies
105
Views
11K
  • · Replies 2 ·
Replies
2
Views
2K
Replies
4
Views
3K
  • · Replies 10 ·
Replies
10
Views
2K
  • · Replies 22 ·
Replies
22
Views
3K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 12 ·
Replies
12
Views
2K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 14 ·
Replies
14
Views
2K