ratchet freak
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 Mar6 comment How is another root -i? @SophieClad that is only true of quadratic equations with coefficients in R Feb20 awarded Nice Answer Feb18 answered How to find the linear matrix of this linear transformation? Feb13 awarded Nice Answer Feb12 revised Is there a commutative operation for which the inverse of the operation is also commutative? edited body Feb12 answered Is there a commutative operation for which the inverse of the operation is also commutative? Feb11 revised Is there a size of rectangle that retains its ratio when it's folded in half? fixing the formatting Feb11 suggested approved edit on Is there a size of rectangle that retains its ratio when it's folded in half? Jan9 comment Why is inverse of orthogonal matrix is its transpose? actually it's not: [[2,0][0,2]] is orthogonal but its inverse is [[0.5,0][0,0.5]]. I think you mean orthonormal Dec15 awarded Caucus Nov13 comment Why is the absolute sign needed in the definition of a bounded function +1 for going to the intent of the notation Nov5 awarded Custodian Nov5 reviewed Approve Finding Transformation matrix between two 2D coordinate frames [Pixel Plane to World Coordinate Plane] Oct11 awarded Yearling Aug31 answered Calculate $n$ points having equal cartesian distance over a single sine wave Aug29 revised finding volume of the cone by using the dot product added 48 characters in body Aug29 comment finding volume of the cone by using the dot product @harry it's actually $u \angle v$ Aug29 comment finding volume of the cone by using the dot product the sine and cosine of the angle between $u$ and $v$ resp. Aug29 answered finding volume of the cone by using the dot product Aug27 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 $\cos x$