in order to obtain the equations of movement of and inverted pendulum mounted on a cart over a seesaw, I have to derive symbolically the Lagrangian equations, which are 3 partial difference equations.
I named them eqn1, eqn2, eqn3.
I obtain these expressions but when I try to derive them I obtain this error:
InverseFunction::ifun: Inverse functions are being used. Values may be lost for multivalued inverses.
and no further derivation is made.
I tried to be pretty coherent with the syntax but I really do not know how to express them. I leave attached my notebook file which is so long to put as a text here.
Attachment: EOM1.nb, URL: ,