A couple things you might keep in mind:
You can replace derivatives with values:
h[1] >>> f = Function('f')
h[1] >>> f(x).diff(x) + x
x + D(f(x), x)
h[2] >>> _.subs(f(x).diff(x), 2)
2 + x
You can work with units:
h[3] >>> import sympy.physics.units as u
h[3] >>> e = 3*u.kg*u.c**2; e # E = m*c**2 for m = 1 kg
269626553621045292*m**2*kg/s**2
h[4] >>> e/u.joules # show the answer in joules
269626553621045292
h[5] >>> e/u.eV # or in eV
1.68287673554558e+36
P.S. Although other may have different feelings, I would prefer to get
a small subset or a single step in the problem about which you have a
question -- even several small questions -- rather than a large chunk
at once.
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