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| Thank you for the nice explanation. I see that you used the FullSimplify function and specified a certain range for x; then tested whether the 2 functions ArcTan and ArcSin are equal over that range. We see that the result is True. Before I... |
| That was the key issue: I see that I need to use the "ComplexExpand" function after I use the "Abs" function. I don't understand yet why that's necessary, but I'll read about the ComplexExpand function very soon. BTW, in my original post, the... |