Causal Function? (Electrical Engr) 1. The problem statement, all variables and given/known data I have the following function: d^2 y(t)/dt^2 + 3* dy(t)/dt + y(t) = dx(t)/dt +2x(t+1) Where y(t) is the output and x(t) is the input. I need to determine if it is causal or non causal. 2. Relevant equations See above. 3. The attempt at a solution My solution is that is causal since I can substitute t_1 = t+1 and t = t_1 -1, substituting this into the equation given: d^2 y(t_1 -1)/dt^2 + 3* dy(t_1 -1)/dt + y(t_1 - 1) = dx(t_1 -1)/dt +2x(t_1) And then if we say that t_1 = 0, I get: d^2 y(-1)/dt^2 + 3* dy(-1)/dt + y(- 1) = dx(-1)/dt +2x(0) And according to the definition, the equation does not depends on future inputs. Is my reasoning correct? Thank You.