Hi! SageMath knows a couple of special values for the cosine function, such as sage: cos(pi/8) 1/2*sqrt(sqrt(2) + 2)
However, SageMath's knowledge of special values of the arccos function seems a lot more limited: sage: arccos(_) arccos(1/2*sqrt(sqrt(2) + 2)) sage: arccos(1/2) 1/3*pi Question: How can one get the exact value of arccos(1/2*sqrt(sqrt(2) + 2)) (which is pi/8)? I tried .simplify_full() and so on, but to no avail. Best regards, Simon -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
