Integral Calculation - Get Help Solving Problems

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Discussion Overview

The discussion revolves around solving a specific integral problem, with participants sharing their approaches and challenges related to integration techniques. The scope includes mathematical reasoning and exploration of substitution methods.

Discussion Character

  • Mathematical reasoning
  • Homework-related
  • Debate/contested

Main Points Raised

  • One participant expresses difficulty in solving an integral and mentions using substitution without achieving a result.
  • Another participant suggests a substitution method to transform sine into cosine.
  • A participant notes that the online integrator "Wolfram Mathematica" provides a complicated indefinite integral and seeks clarification on how to simplify it.
  • One participant proposes a manipulation of the integral to evaluate it from 0 to 1, indicating a transformation involving sine.
  • Another participant confirms the substitution and expresses uncertainty about the correctness of their resulting expression.
  • There is a repeated suggestion to use a different substitution involving cosine.
  • A participant mentions that Mathematica cannot evaluate the definite integral due to convergence issues, suggesting numerical integration as a possible solution.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the correctness of the integral transformations or the evaluation methods. Multiple competing views and approaches remain present in the discussion.

Contextual Notes

There are limitations regarding the convergence of the function between 0 to 1, and the discussion includes unresolved mathematical steps related to the integral's evaluation.

cataldo
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I have some problem with following integral. In attachment a pdf with integral..
I have done a integration by sobstitution but i have not a result ...
Tank for your in interest
best regards
 

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why couldn't you type that out? :frown:

try substituting so that sin becomes cos of something else.
 
Ok...
I have done this question because the calculate on site "wolfram mathematica online integrator" only indefinite integral is very complicated and i don't understand as i can obtain this...
Cataldo...
 

Attachments

By a little manipulation you can transform it into an integral from 0 to 1 of the following:

2[(1+x)1/2 + [(1-x)1/2]/(1-x2). Essentially this was done by collapsing the integral into 0 to pi/2 and then letting x=sin.

See if you can go further.
 
Ok...Tanks mathman
Is exactly x=sin and integral from 0 to 1.. but i obtain [(1+x)^(1/2)]/(1-x^2)... Does it correct?
 
tiny-tim said:
why couldn't you type that out? :frown:

try substituting so that sin becomes cos of something else.

how about sinx = cos(π/2 - x)? :wink:
 
cataldo said:
Ok...Tanks mathman
Is exactly x=sin and integral from 0 to 1.. but i obtain [(1+x)^(1/2)]/(1-x^2)... Does it correct?

The sin is positive from 0 to pi and negative from pi to 2pi. I first collapsed the second interval into the first, so I had two terms: 1+sin and 1-sin. Next collapsing to 0 to pi/2 with a factor of 2. Finally let x=sin.
 
Hi nathaman..Tanks for your replay
I understand your method but the software mathematica can not assess the definte integral because the fuction between 0 to 1 not converge...exist the indefinte integral indeed mathematica assess it... I think that is necessary assess it by numerical integration...
 

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