Jean-Sébastien
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 Oct5 reviewed Looks OK Let $n$ be an integer. Prove that if $2|n$ and $3|n$, then $6|n$ Oct5 reviewed Looks OK Let $n$ be an integer. Prove that if $2|n$ and $3|n$, then $6|n$ Oct5 reviewed Looks OK Summation of polynomial expression Apr10 reviewed Approve Sudoku candidate probability Apr9 reviewed Edit Is my second equation right? Apr9 reviewed Approve How to use the Maclaurin Series to get $f^{10}(0)$ of $f(x)=(\cos(3x^2)−1)/x^2$ Apr9 reviewed Reject Finding the point on the curve at which the normal is parallel to a given line. Jan9 reviewed Approve Prove that $\frac12 < 4\sin^2\left(\frac{\pi}{14}\right) + \frac{1}{4\cos^2\left(\frac{\pi}{7}\right)} < 2 - \sqrt{2}$ Oct27 reviewed No Action Needed Find $a\in\mathbb{N}$ such that $n^4+a$ is not prime $\forall n\in\mathbb{N}$ Oct22 reviewed Approve Polynomial inequality proof Oct22 reviewed Reviewed prove that quadrangle is isosceles trapezoid Oct21 reviewed Approve $x^{y^z}$: is it $x^{(y^z)}$ or $(x^y)^z$? Oct16 reviewed Looks OK Residue at $0$ of $\frac{1-\cos z}{z^4}$ Oct16 reviewed Approve Fuchsian Groups: A counterexample Oct15 reviewed No Action Needed probability without replacement and unknown number in urn Oct15 reviewed Looks OK How do I reduce this: $\frac{2}{x\ln(4)}\quad ?$ Oct15 reviewed No Action Needed If $x$ is irreducible, and $x\nmid y$, why are $x$ and $y$ relatively prime? Oct14 reviewed Reject Question on questions in Spivak's Calculus? Oct14 reviewed Approve Integration by parts: $\int xe^{-x}dx$ Oct12 reviewed Approve real analysis functions and interval