in python sympy we define that x is function of t: x(t)

and diff(x,t) is xdot

x=sym.Function(‘x’)(t)

how to do this thing in julia

bcz i have to write Lagrangian equation

Look at Symbolics.jl

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It isn’t so different in Julia:

```
julia> using SymPy
julia> @syms t x()
(t, x)
julia> diff(x(t), t)
d
──(x(t))
dt
```

The symbolics style, should also be mirrored:

```
julia> ∂ = Differential(t)
Differential(t)
julia> ∂(x(t))
d
──(x(t))
dt
```

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