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 Aug 26 awarded Autobiographer Dec 11 awarded Popular Question Feb 6 asked Given one endpoint on an arc of a circle and the radius and arc angle, how to calculate the other endpoint of the arc? Oct 14 accepted reducing invertible matrix in an equation of matrix Oct 14 comment reducing invertible matrix in an equation of matrix could you explain the steps for me? thanks Oct 13 comment reducing invertible matrix in an equation of matrix thanks for the help. I think i misinterpreted the problem and now I'm going with A as a 3x3 matrix Oct 13 comment reducing invertible matrix in an equation of matrix @EuYu i think i may have interpreted this question incorrectly, now A is really invertible Oct 13 revised reducing invertible matrix in an equation of matrix edited body Oct 12 comment reducing invertible matrix in an equation of matrix @EuYu going from that, can't I take off A transpose from both sides? Oct 12 revised reducing invertible matrix in an equation of matrix added 30 characters in body Oct 12 revised reducing invertible matrix in an equation of matrix added 2 characters in body Oct 12 comment reducing invertible matrix in an equation of matrix hmm you guys are right, that makes no sense. If we assume that ATA is invertible, then what does this reduce to? Oct 12 asked what is an integral multiple of a period? Oct 12 asked reducing invertible matrix in an equation of matrix Apr 13 awarded Scholar Apr 13 accepted Why is $|1+e^{i\phi}|=|2\cos(\phi/2)|$? Apr 13 awarded Supporter Apr 13 awarded Editor Apr 13 revised Why is $|1+e^{i\phi}|=|2\cos(\phi/2)|$? forgot to include abs value Apr 13 asked Why is $|1+e^{i\phi}|=|2\cos(\phi/2)|$?