# adjoint() does not work with trig functions.

adjoint() works for symbolic matrices except for those that have trig functions such as tan, sec, or tanh in their entries. Is there an easy way around this or do I need to create my own ajdoint() function? Thanks much.

nonlinear

It works here. Using sage-5.9. Also works with sage-5.7. You need to provide more information (the error you get, etc) other than "it doesn't work".