This is a striking result and illustrates the power and simplicity of describing the
coupled motion in terms of the normal coordinates. For each of the independent
coordinates q1 and q2 we have the equation for forced oscillations of a simple
harmonic oscillator, i.e. an equation of the same form as Equation (3.1) in Section
3.2.1, and we can at once take over the solutions, Equations (3.5a) and (3.7a),
from that section. We can describe the steady state solutions by the equations
q1 = C1 cos ωt and q2 = C2 cos ωt, where