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 1d comment How to find linear equation from text solve the system of linear equations by using your two given Points Apr20 revised Find the max and min of $f(x) = x^5 -x^4+x^2-x$ added 2 characters in body; edited title Apr20 reviewed Approve Finding local maximum and minimum Apr20 comment How to prove that $C([0,1])$ is not dense in $L^{\infty}([0,1])$ Apr20 revised How to prove that $C([0,1])$ is not dense in $L^{\infty}([0,1])$ added 4 characters in body; edited title Apr18 comment maximum area of semi-circle in square Thanks a lot for the answer. Apr18 accepted maximum area of semi-circle in square Apr18 asked maximum area of semi-circle in square Dec23 awarded Constituent Dec9 awarded Caucus Dec3 comment Isosceles triangle and scalene triangle Use Heron formula: $A=\sqrt{s(s-a)+(s-b)+(s-c)}$ and $2s=a+b+c$. Nov17 comment Conditional Expectation Question from Grimmett & Stirzaker 1000 exercises in probability What's the definition of $E(X|Y)? Plug in your conditions. Oct2 accepted Application of Desargues' theorem for constructions Sep30 awarded Explainer Sep19 comment Application of Desargues' theorem for constructions Opening two questions for the same topic isn't appropriate Sep19 asked Application of Desargues' theorem for constructions Sep17 comment Integral of$x^x$use$y=x^x\$ (there is no closed form) Jul23 awarded Yearling Jul6 comment Solving congruences @JoeJohnson126 because 7 is not equivalent to 1 mod 5 (congruence II) Jul6 comment Solving congruences Thanks, with necessary/sufficient it seems quite logical. Thanks a lot.