Consider the models given below where the independent variable is t and the dependent variable is y. All other letters represent constants, e.g. m is mass, B is the coefficient of damping, k is the spring constant, and C is a small constant. Identify the nonlinear models (there are 3 correct responses out of 5). tad- dy +3 d+2 = cos(at) dt dy m - + 8: ty = In(t=) dt 2 dt day dy 0 0 0 0 0 + B tyt Ey" = 0 dt2 dt + 5 dy + k sin(y) = 0 d+2 dt dy + y + 4y = t dt2 dt