[sage-support] Cosine function erro

Dear sage-support, I'm getting the following unexpected results: sage: cos(2*pi*4/7).n() 0.900968867902419 sage: cos((2*pi*4/7).n()) -0.900968867902419 What is going on here? Clearly the result should be negative both times. Thanks, Shaun Ault -- You received this message because yo

[sage-support] Problem with sage binary for rhel

umpy.lib import triu ---> 23 from numpy.linalg import lapack_lite 24 from numpy.matrixlib.defmatrix import matrix_power 25 from numpy.compat import asbytes ImportError: libgfortran.so.1: wrong ELF class: ELFCLASS32 Please advise!! Thanks, -Shaun Ault -- "The doctors treat