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 May 25 asked Reflecting a point over a line created by two other points May 24 answered Compound angle formula confusion May 24 comment Finding the distance between two gears Nope, you got it! :D May 24 comment Subtract gravity from 3D object in different orientations @Steven: You're quite welcome. :) May 24 revised Subtract gravity from 3D object in different orientations Revised. May 24 comment Subtract gravity from 3D object in different orientations @Steven: Yes, there is that important caveat. Well, if you know how to do matrix multiplication, then you can derive the matrix yourself by multiplying the three simpler rotation matrices in the proper order. May 24 revised Subtract gravity from 3D object in different orientations Updated in light of real-world observations. May 24 comment Subtract gravity from 3D object in different orientations @Steven: Huh, interesting. I didn't do any testing myself, I just found this matrix and did the relevant multiplication...so I suppose it's possible they had a typo or something. May 24 comment Probability that 5 different faces come up twice each if 6 side die is rolled ten times? @meiryo: en.wikipedia.org/wiki/… May 24 revised Trying to plot these points in a polar coordinate system LaTeX formatting. May 24 suggested approved edit on Trying to plot these points in a polar coordinate system May 23 answered Prove that 2 students live exactly five houses apart if May 23 revised Anti-prime sequence LaTeX formatting May 23 suggested approved edit on Anti-prime sequence May 23 revised Boundary conditions of an elastic bar LaTeX formatting. May 23 suggested approved edit on Boundary conditions of an elastic bar May 23 answered Subtract gravity from 3D object in different orientations May 23 comment Number of ways of spelling Abracadabra in this grid I think your problem is that you're treating picking the "A" as one of two choices, when there's really nothing you can do about it. Two routes to a B and two from each B to an R gives $2*2 = 4$ ways. May 22 revised imaginary numbers - how can I understand them - especially as they occur in 'roots' of polynomials? LaTeX formatting. May 22 suggested approved edit on imaginary numbers - how can I understand them - especially as they occur in 'roots' of polynomials?