# Applying the Lagrange Euler Formulation

I was doing my tutorial on Lagrange-Euler formulation for robotic systems when i came across a slight problem. Referring to the picture in the link, I would like to know if my answer (equation 1) (more specifically my method of differentiating) is correct, given that theta_one, theta_two, theta_one_dot, and theta_two_dot are all functions of t.