## anonymous 5 years ago how do you find a steady periodic function

I didn't understand properly ... can you explain please?

2. anonymous

$x \prime \prime + 4 x \prime +4x = 10\cos 3t$ find the steady periodic solution $C \cos (\omega t -\alpha)$

3. anonymous

$mx \prime \prime +cx \prime+kx = F(t)$