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 Jun 19 comment Derivative of a composition Yes, thank you for the precision ! Jun 19 asked Derivative of a composition Jun 7 comment Where does complex exponential come from? Thank you for the answer. This sounds now really clear to me. Jun 7 accepted Where does complex exponential come from? Jun 7 asked Where does complex exponential come from? May 31 comment Sum of $\cos(k x)$ It was what I was looking for to go on. Thank you ! May 31 comment Sum of $\cos(k x)$ Thank you for your answer ! May 31 accepted Sum of $\cos(k x)$ May 31 comment Sum of $\cos(k x)$ I get $\frac{\cos{x}-\cos{(n+1)x}+\cos{nx}-2}{2-2\cos{x}}$. It may be false though... May 31 revised Sum of $\cos(k x)$ deleted 21 characters in body May 31 comment Sum of $\cos(k x)$ It was a mistake in the question, the sum is on k and x is a variable. I edited it. May 31 asked Sum of $\cos(k x)$ Mar 13 comment Simplify arithmetic equation Interesting algorithm indeed. Mar 13 comment Simplify arithmetic equation That was the proof I was trying to find myself. Thank you ! Mar 12 comment Simplify arithmetic equation Thank you for your answer ! Mar 12 accepted Simplify arithmetic equation Mar 12 asked Simplify arithmetic equation Feb 24 answered Boolean simplification with some known term combinations Feb 24 comment Boolean simplification with some known term combinations What do you mean by "implement" ? Feb 23 comment Game analysis : Is it worth it to steal the box? Nice approach to the problem ! Thank you !