code: def main():
      x = Symbol("x")
      f = Function("f")
  
      eq = Eq(f(x).diff(x), f(x))
      print("Solution for ", eq, " : ", dsolve(eq, f(x)))
  
      eq = Eq(f(x).diff(x, 2), -f(x))
      print("Solution for ", eq, " : ", dsolve(eq, f(x)))
  
      eq = Eq(x**2 * f(x).diff(x), -3 * x * f(x) + sin(x) / x)
      print("Solution for ", eq, " : ", dsolve(eq, f(x)))
  
label_desc: Use image node_id 1 for calling a global function with example usage: main() without return types