# I 2nd order linear ODE with varying coefficients

1. Dec 16, 2016

How could I solve following differential equation?
$$\frac {d^2x} {dt^2} - [a \cos {(\omega t + \phi_0)} + c] x = b \cos {(\omega t + \phi_0)} + d$$

Where $$a, b, c, d, \omega, \phi_0$$ are real coefficients.