Hi! Is there a methode on the ti85 to make derivation like this: example: f(x)=2x+3 and the result is f'(x)=2 thanks! .---. .----------- / \ __ / ------ / / \(..)/ ----- ////// \/ ` --- Erwan (Vélocity) //// / // : : --- // / / /` '-- Xiorced.ed@hol.fr // //..\\ ====UU====UU==== '//||\\` ''``