class_docstr: The class used to define vectors.
  
  It along with ReferenceFrame are the building blocks of describing a
  classical mechanics system in PyDy and sympy.physics.vector.
  
  Attributes
  ==========
  
  simp : Boolean
      Let certain methods use trigsimp on their outputs
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docstr: Returns the free dynamic symbols (functions of time ``t``) in the
  measure numbers of the vector expressed in the given reference frame.
  
  Parameters
  ==========
  reference_frame : ReferenceFrame
      The frame with respect to which the free dynamic symbols of the
      given vector is to be determined.
  
  Returns
  =======
  set
      Set of functions of time ``t``, e.g.
      ``Function('f')(me.dynamicsymbols._t)``.
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code: def free_dynamicsymbols(self, reference_frame):
      """Returns the free dynamic symbols (functions of time ``t``) in the
      measure numbers of the vector expressed in the given reference frame.
  
      Parameters
      ==========
      reference_frame : ReferenceFrame
          The frame with respect to which the free dynamic symbols of the
          given vector is to be determined.
  
      Returns
      =======
      set
          Set of functions of time ``t``, e.g.
          ``Function('f')(me.dynamicsymbols._t)``.
  
      """
      # TODO : Circular dependency if imported at top. Should move
      # find_dynamicsymbols into physics.vector.functions.
      from sympy.physics.mechanics.functions import find_dynamicsymbols
  
      return find_dynamicsymbols(self, reference_frame=reference_frame)
  
imports: from sympy import S, sympify, expand, sqrt, Add, zeros, acos, ImmutableMatrix, simplify
  from sympy.simplify.trigsimp import trigsimp
  from sympy.printing.defaults import Printable
  from sympy.utilities.misc import filldedent
  from sympy.core.evalf import EvalfMixin
  from mpmath.libmp.libmpf import prec_to_dps
label_desc: Use image node_id 34 for calling the Vector obj's underlying member method code with example usage: obj.free_dynamicsymbols(reference_frame) and returns: find_dynamicsymbols