30. A particle moves along the x-aXis with position at time t given by 360.\") = e_tsint for 0 S t S 2n. (a) Find the time t at which the particle is farthest to the left. Justify your answer. (b) Find the value of the constant A for which x(t) satises the equation Ax"(t) + x'(t) + x(t) = 0 for 0