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 Dec11 awarded Popular Question Feb6 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? Oct14 accepted reducing invertible matrix in an equation of matrix Oct14 comment reducing invertible matrix in an equation of matrix could you explain the steps for me? thanks Oct13 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 Oct13 comment reducing invertible matrix in an equation of matrix @EuYu i think i may have interpreted this question incorrectly, now A is really invertible Oct13 revised reducing invertible matrix in an equation of matrix edited body Oct12 comment reducing invertible matrix in an equation of matrix @EuYu going from that, can't I take off A transpose from both sides? Oct12 revised reducing invertible matrix in an equation of matrix added 30 characters in body Oct12 revised reducing invertible matrix in an equation of matrix added 2 characters in body Oct12 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? Oct12 asked what is an integral multiple of a period? Oct12 asked reducing invertible matrix in an equation of matrix Apr13 awarded Scholar Apr13 accepted Why is $|1+e^{i\phi}|=|2\cos(\phi/2)|$? Apr13 awarded Supporter Apr13 awarded Editor Apr13 revised Why is $|1+e^{i\phi}|=|2\cos(\phi/2)|$? forgot to include abs value Apr13 asked Why is $|1+e^{i\phi}|=|2\cos(\phi/2)|$? Feb6 awarded Student