Integration of tan^2 x from - to + infinity

In summary, the conversation was about an integral in quantum mechanics which does not converge. The hint given was to use the derivative of tangent x to solve the problem. The person expressing the problem is new to the Physics forum.
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stringsofphysics
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TL;DR Summary
integral from minus to plus infinity of tan^2 x
∫tan^2 x ( -infinity to +infinity)
 
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  • #2
This integral doesn’t converge. (Hint: ##1+\tan^2x=\frac{d}{dx}\tan x##)

Is there a certain context in which this appeared?

P.S. I assume the last thread was deleted by a mod. If so, this will probably also be deleted. You should provide your own efforts to solve the problem.
 
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  • #3
Thank you for the reply, it appeared in a part of sum in quantum mechanics.

P.S. I am new to Physics forum. Sorry, not used to its norms
Thanks for inputs!
 
  • #4
stringsofphysics said:
Thank you for the reply, it appeared in a part of sum in quantum mechanics.

P.S. I am new to Physics forum. Sorry, not used to its norms
Thanks for inputs!
If it's homework, and you would like help, we would like to help you with your homework in order to help you to learn; however, we don't want to just plain do it for you ##-## as @suremarc indicated, you should make and show an attempt ##-## and please use ##\mathrm {\LaTeX}## ##-## if it's not homework, please let us know ##-## your reply that included your saying "it appeared as part of a sum in quantum mechanics" leaves whether it's homework or not as something of a curiosity ##\dots##
 
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@stringsofphysics has been asked to repost in the schoolwork forums and show their work so that we can provide more tutorial help. This thread is closed.
 

1. What does the integration of tan^2 x from - to + infinity represent?

The integration of tan^2 x from - to + infinity represents the area under the curve of the function tan^2 x, from negative infinity to positive infinity.

2. What is the formula for integrating tan^2 x from - to + infinity?

The formula for integrating tan^2 x from - to + infinity is ∫tan^2 x dx = x - (1/3)tan^3 x + C.

3. Can the integration of tan^2 x from - to + infinity be solved using substitution?

Yes, the integration of tan^2 x from - to + infinity can be solved using the substitution method, where u = tan x and du = sec^2 x dx.

4. What is the significance of integrating tan^2 x from - to + infinity?

The integration of tan^2 x from - to + infinity is significant in calculus and mathematics as it involves finding the area under a curve, which has many real-world applications in fields such as physics, engineering, and economics.

5. Is the integration of tan^2 x from - to + infinity a convergent or divergent integral?

The integration of tan^2 x from - to + infinity is a divergent integral, meaning that it does not have a finite value. This is because the function tan^2 x has vertical asymptotes at x = (2n + 1)π/2, where n is an integer, and the area under these asymptotes is infinite.

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