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 Mar22 awarded Yearling Mar13 comment When, how & who first gave this calculation of $\pi$ Euler, I suppose. Mar13 revised Series solution to first order differential equation added 525 characters in body Mar13 answered Series solution to first order differential equation Jan21 awarded Popular Question Dec3 comment Definite integral reciprocal of polynomial plus trig function $x^{1/4}$ is definitively not a polynomial... And, however, the integrand seems not to be elementary integrable. Neverthless, the definite integral exists (because the integrand is everywhere continuous in $[0,\pi/2]$), it is a positive real number (for the integrand is positive in $[0,\pi/2]$) and it approximately equals $1$. ;-) Dec3 revised Useful mathematical fora added 345 characters in body Oct11 awarded Notable Question Sep30 awarded Explainer Aug28 awarded Nice Answer Jul16 awarded Popular Question Jul2 awarded Curious Apr9 answered A basic question on bound of a function Apr9 comment A basic question on bound of a function Oh, now I see... Apr9 comment A basic question on bound of a function What about $a=0$? ;-) Apr5 awarded Nice Answer Mar22 awarded Yearling Sep22 answered $\sum_{j=3n}^{2n}a_{j}=\sum_{j=2n}^{3n}a_{j}$: true or false? Aug17 awarded Nice Question Apr9 awarded Tumbleweed