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 Sep1 revised Easy polynomials question? format:latex Sep1 suggested approved edit on Easy polynomials question? Aug29 revised Prove $\cos((3\pi/4)+x)-\cos((3\pi/4)-x)=(-\sqrt{2})\sin(x)$ format:latex Aug29 suggested approved edit on Prove $\cos((3\pi/4)+x)-\cos((3\pi/4)-x)=(-\sqrt{2})\sin(x)$ Aug29 revised How to prove $\int_0^\infty e^{-x^2} \; dx = \frac{\sqrt{\pi}}2$ without changing into polar coordinates? added 205 characters in body Aug29 revised How to prove $\int_0^\infty e^{-x^2} \; dx = \frac{\sqrt{\pi}}2$ without changing into polar coordinates? added 205 characters in body Aug29 answered How to prove $\int_0^\infty e^{-x^2} \; dx = \frac{\sqrt{\pi}}2$ without changing into polar coordinates? Aug29 revised Prove $\sin((n+1)x) \sin((n+2)x)+\cos((n+1)x) \cos((n+2)x)=\cos(x)$ parenthesis Aug29 suggested approved edit on Prove $\sin((n+1)x) \sin((n+2)x)+\cos((n+1)x) \cos((n+2)x)=\cos(x)$ Aug29 answered Prove $\cos\left(\frac{3\pi}{2}+x\right)\cos(2\pi+x)\left[\cot\left(\frac{3\pi}{2}-x\right)+\cot(2\pi+x)\right]=1$ Aug29 revised Prove $\cos\left(\frac{3\pi}{2}+x\right)\cos(2\pi+x)\left[\cot\left(\frac{3\pi}{2}-x\right)+\cot(2\pi+x)\right]=1$ format:latex Aug29 suggested approved edit on Prove $\cos\left(\frac{3\pi}{2}+x\right)\cos(2\pi+x)\left[\cot\left(\frac{3\pi}{2}-x\right)+\cot(2\pi+x)\right]=1$ Aug28 comment Arranging people in a row van Leewen:I deleted my answer.thanks Aug28 comment Arranging people in a row I'm not sure about my answer...Can you explain me why my approach might be incorrect?Consider the side sits which are 2: We choose 2 from n people sitting at sides:nC(2) we have n-2 people remaining. We triple this remaining so we have 3(n-2) abstract people now because there are two invisible people sitting beside anyone ā kC(3nā6) The final answer is: nC(2)×kC(3nā6) Aug28 comment The mathematics behind Fourier Transform for Image Processing Did you check en.wikipedia.org/wiki/Discrete_Fourier_transform ? Aug28 revised Point on the line twice as far from P as from Q added 150 characters in body Aug28 revised Point on the line twice as far from P as from Q added 150 characters in body Aug28 answered Point on the line twice as far from P as from Q Aug27 comment Shortest paths from $s$ by weight which contain even number of edges @Belgi WOW! how did you come up with this? Aug27 comment How long does it take to consume the same amount of food @dbaupp fixed it.thanks ;)