But usually Universities teach it in the first year.

I was thinking of putting a small introduction to it on this website.

]]>here's the eqn

m[d^2x/dt^2 + wsubo^2 x] = F cos wt

I'm supposed to show that x(t) = xsubo cos wt

w is the incident freq

wsubo is the resonant freq

m is mass

I'm guessing it has to be shown by undetermined coefficients but I can't find the right path exactly.

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