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| One good example, done here in Mathematica, is the simple harmonic oscillator, using F = m a, where F = - k x In[1]:= DSolve[m * x''[t] == -k * x[t], x[t], t] Out[1]= {{x[t] -> C[1] Cos[(Sqrt[k] t)/Sqrt[m]] + C[2]... |