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 Aug 31 answered Calculate $n$ points having equal cartesian distance over a single sine wave Aug 29 revised finding volume of the cone by using the dot product added 48 characters in body Aug 29 comment finding volume of the cone by using the dot product @harry it's actually $u \angle v$ Aug 29 comment finding volume of the cone by using the dot product the sine and cosine of the angle between $u$ and $v$ resp. Aug 29 answered finding volume of the cone by using the dot product Aug 27 comment Evaluating $\ln(\cos x))$ using Taylor expansion you should be using different unknowns, now the $x$ in the $\ln$ expansion is different from the $x$ in $\cos x$ Aug 21 revised The process of solving the inequality $\frac{8}{19} x\ge -1$ corrected equations Aug 21 suggested approved edit on The process of solving the inequality $\frac{8}{19} x\ge -1$ Jul 10 comment How to create circles and or sections of a circle when the centre is inaccessible and your print screen button doesn't work? May 19 comment Number of ways to order numbers such that greatest number proceeds smallest number which is equal to $\frac{n!}{2}$ May 17 answered What did Johann Bernoulli wrong in his proof of $\ln z=\ln (-z)$? May 16 comment Proving that all eigenvalues are $0$ bar one. it's sufficient to prove that all $Ax=a\mathbf{e}$ Apr 17 comment Why does $n^0 = 1$? there is $$n^k = \Pi^k_{i=1}i$$ but that relies on $$\Pi^0_{i=1}i=0$$ Apr 10 comment Visually deceptive “proofs” which are mathematically wrong result of the assumption that $\sqrt b \cdot \sqrt a = \sqrt{a\cdot b}$ for all reals $a$ and $b$ instead of only for positive reals Apr 7 comment Visually deceptive “proofs” which are mathematically wrong all of the answers below rely on a slight bend in a diagonal line which accounts for the missing area Apr 4 answered Can a coin with an unknown bias be treated as fair? Mar 18 comment Minimum number of different clues in a Sudoku must resist urge to solve sudoku... Mar 13 comment Can $\frac {100-100}{100-100}=2$? or a square of a negative number; the logarithm of a negative number, those are the most common but any multivalued function can be used Mar 4 comment For all square matrices A and B of the same size, it is true that (A+B)^2 = A^2 + 2AB + B^2 @Nicholas because distributiveness works even when $AB\ne BA$ (it's not related) Feb 26 comment Interesting and unexpected applications of $\pi$ isn't this the just the series expansion of $\arctan 1$?