Please help

Find the charge and current at time t if R 40 ohms, L 1 henry, C' 16 x farad, E(t) 100 cos I()t, and the initial charge and current are both o. 116 sin 15t) -F (21 cos 10t -F 16 sin Ans: q(t) A- cos 15t I [e 20t(-1920cos 15t + 13, 060 sin 15t) + 10t 21 sin lot)] i(t) 2091