Introducing the Wolfram calculator for indeterminate integrals, reworked a bit by me:
The matter is simple: in the calculator we enter the formula (according to the Rules) – without dx, click on ‘Calculate’ and we have a calculated integral.
For example, to count \int{\frac{{{x}^{2}}}{{{x}^{2}}+1}}dx we enter into the calculator: x^2/(x^2+1).
That’s it, I hope the calculator is useful to you. If you have trouble using it, let us know in the comments under the post.
