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Mar
14
awarded  Editor
Mar
14
revised Solve $\cos^2x-\sin^2x= 1$
added the end of solution
Mar
14
suggested approved edit on Solve $\cos^2x-\sin^2x= 1$
Oct
24
awarded  Supporter
Oct
9
awarded  Teacher
Oct
9
answered Logic nonsense/paradox
Apr
24
awarded  Autobiographer