Unit3: Forward Kinematics exercise 3.4

In Forward kinematics Unit, ecxercise 3.4, tb_1.py, after executing getting the required result,
but in next para it is told that for nice appearing we replace theta_1 to its symbol θ1, but i am getting this
result, also programs are same, i am unable to understand where i am doing wrong
need help please.


Could you post the program you are using here? In theory, changing the symbols is just a matter of changing it in the python script