CAS.diff command results diff command again

[josephec]

(06-10-2017 02:43 PM)roadrunner Wrote:  Have you tried:

EVAL(diff(fx,X))

-road

Thanks roadrunner,
I alredy tried EVAL(diff(fx,X))
The problem is if fx has funtion like 'SEC(X)+X^2'
diff returns diff(SEC(X),X)+2*X and EVAL will solve the diff issue but also will replace the X with its value.

I appreciate this and future suggestions.
Best regards!!
jose