Jean-Sébastien
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 Feb 18 comment Reduced Row Echelon Matrices Yup, depending on what's expected you might need to put that into maths but you've got the idea Feb 18 comment Reduced Row Echelon Matrices There are n rows and each 1s must be further to the right than the ones above Jan 17 comment Is it possible to solve following integral with partial-fraction decomposition? Use long division first Oct 8 comment Lesser-known integration tricks @N3buchadnezzar I'm also interrested in a translation should it come! Oct 7 comment Nonexistence of a limit This does not say that the limit does not exist. It states the condition for a given L to not be the limit. If you'd want to show that the limit does not exist, you would have to do it for all L as well Sep 25 comment Problem with definite integral $\int _0^{\frac{\pi }{2}}\sin \left(\arctan \left(x\right)+x\right)dx$ @Asydot you are right, I guess I only tried the indefinite integral on wolfram. Sep 25 comment Problem with definite integral $\int _0^{\frac{\pi }{2}}\sin \left(\arctan \left(x\right)+x\right)dx$ both maple and wolfram can't find it, even the definite integral Sep 24 comment Partial Fraction Decomposition trouble $\frac{1}{(1+x^2)(1+x^{2015})}$ I doubt you want to do that May 25 comment How many three digit numbers with increasing digits can be formed from the set $\{1, 2, 3, 4, 5, 6, 7, 8\}$? Care to explain, downvoter? May 23 comment Finding line that divides an area into equal halves. The error is when you factor the $\sqrt{1-k}$. More precisely, look at the $(1-k)^{3/2}$. May 21 comment Finding the period of $f(x) = \sin 2x + \cos 3x$ Yes, that will be it May 21 comment what will be the value of this integral At brilliant's, there were absolute value that you missed inside the logarithm May 19 comment If you fold a rectangular piece of paper in half What's the solution needing verification? Mar 17 comment Where do summation formulas come from? Finite calculus is one way of computing sums cs.purdue.edu/homes/dgleich/publications/… Feb 26 comment Investigate the convergence of $\int_0^\infty (-1)^\left[{x^2}\right] \, dx$ @AlonAlon because $[x^2]$ is an integer. Nov 18 comment Are the equations $2x - 2y = 11, x = y - 2$ unsolvable? This is most likely what was expected from the teacher Oct 5 comment What is meant by“…on se ramène par régularisation…”? Careful, "Dénombrable à l'infini" does not mean countably infinite. It is rather linked with a locally compact spaces. I think it means that the space can be written has a countabble compacts family Sep 23 comment Why is the polynomial $f(x)=x^3+x^2+x+1$ monotonic? You can upvote all relevant, and accept (and also upvote) the one that suits you best Sep 22 comment Prove that $f(x)=x^4+8x^3+x^2+2x+5$ is irreducible in $\mathbb Q[x]$ Do you know the rational root test? May 2 comment Calculating this integral: $I=\int_{0}^{\infty}(\log t)\,(\tan^2t)\,\mathrm{d}t$ You have bounds $0$ and $\infty$ in the title but some other numbers in the body, which is it?