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- L = m (z'[t]^2)/2 - m g z[t]
- D[D[L, z'[t]],t] - D[L,z[t]] == 0
- g m + m z''[t] == 0
- L = m (x'[t]^2 + y'[t]^2) / 2;
- MapThread[Function[{q, v, h}, D[D[L,v],t] - D[L,q] == h],
- {{x[t], y[t]}, {x'[t], y'[t]}, {fx[t], fy[t]}}]
- {m x''[t] == fx[t], m y''[t] == fy[t]}
- D[exp[t]^2 / 2, exp[t]]
- exp[t]
- D[Exp[t]^2 / 2, Exp[t]]
- General: Exp[t] is not a valid variable.
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