Jean-Sébastien
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 May 21 answered Finding the period of $f(x) = \sin 2x + \cos 3x$ 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? May 15 awarded Yearling Apr 21 revised Evaluate the integral $\int \sin(x)\cos(3x^2)dx$ added 2 characters in body 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. Feb 26 answered Problem with evaluating the exact value of an integral Dec 20 awarded Constituent Dec 8 awarded Caucus 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 Oct 5 reviewed Looks OK Summation of polynomial expression Oct 5 awarded Custodian Sep 30 awarded Explainer 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? Aug 8 revised How many $4$ digit even numbers have all $4$ digits distinct? added 1 character in body Jul 2 awarded Curious Jul 1 answered If $X$ is distributed normally with mean $0$, is it correct to say $X$ and $-X$ “have the same distribution”?