Difficult Integral Question: Need Help Solving LaTeX Code

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SUMMARY

The integral in question, ##\int_{0}^{\infty}\frac{x}{x^2+1}\tan{x}\cos{((\tan(x))^2)}dx##, does not have an elementary antiderivative, making it challenging to solve using standard techniques such as integration by parts or substitutions. The user attempted to utilize Wolfram Alpha and MATLAB for a solution but encountered limitations due to premium requirements and computational difficulties. The integral originated from a non-academic source, specifically a narrative about high school life, leading to the conclusion that pursuing a closed-form solution may be futile. A suggested alternative is to explore the Taylor series expansion of the involved functions for potential integration.

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Please help, I am not sure if you can read my latex code. A friend of mine sent this to me before her final exam, I have been trying to solve it for 3-4 days. I used some substitutions, I tried integration by parts but couldn't get a solution. I used wolfram alpha but it needs more time and for that I have to be premium. I couldn't get this solved on Matlab.
##\int_{0}^{\infty}\frac{x}{x^2+1}\tan{x}\cos{((\tan(x))^2)}dx##
 
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Where does this integral come from? It doesn't appear to have an elementary antiderivative, so do you have any reason to believe you'll be able to find a closed-form solution?
 
axmls said:
Where does this integral come from? It doesn't appear to have an elementary antiderivative, so do you have any reason to believe you'll be able to find a closed-form solution?
Well, I just asked my friend she said that she didn't actually take this from a textbook. There was a book or something a guy is talking about his high school life and then there is this integral on the page like an image or something. Well, it turns out I was just wasting my time.
Still, I wonder do you have solution of this, the one thing comes to my mind is to find Taylor series of each function and integrate.
 

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