error

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-156-4180082d09fd> in <module>()
----> 1 sin(1/a).is_constant()

/home/aries/foss/sympy/sympy/core/expr.pyc in is_constant(self, *wrt, **flags)
    548                 except ZeroDivisionError:
    549                     b = None
--> 550                 if b is not None and b is not S.NaN and b.equals(a) is False:
    551                     return False
    552                 # try random real

/home/aries/foss/sympy/sympy/core/expr.pyc in equals(self, other, failing_expression)
    608         # because if the expression ever goes to 0 then the subsequent
    609         # simplification steps that are done will be very fast.
--> 610         diff = factor_terms((self - other).simplify(), radical=True)
    611 
    612         if not diff:

/home/aries/foss/sympy/sympy/core/expr.pyc in simplify(self, ratio, measure)
   2969         from sympy.core.function import count_ops
   2970         measure = measure or count_ops
-> 2971         return simplify(self, ratio, measure)
   2972 
   2973     def nsimplify(self, constants=[], tolerance=None, full=False):

/home/aries/foss/sympy/sympy/simplify/simplify.pyc in simplify(expr, ratio, measure, fu)
    554     if expr.has(TrigonometricFunction) and not fu or expr.has(
    555             HyperbolicFunction):
--> 556         expr = trigsimp(expr, deep=True)
    557 
    558     if expr.has(log):

/home/aries/foss/sympy/sympy/simplify/trigsimp.pyc in trigsimp(expr, **opts)
    511                    }[method]
    512 
--> 513     return trigsimpfunc(expr)
    514 
    515 

/home/aries/foss/sympy/sympy/simplify/trigsimp.pyc in <lambda>(x)
    504     trigsimpfunc = {
    505         'fu': (lambda x: fu(x, **opts)),
--> 506         'matching': (lambda x: futrig(x)),
    507         'groebner': (lambda x: groebnersimp(x, **opts)),
    508         'combined': (lambda x: futrig(groebnersimp(x,

/home/aries/foss/sympy/sympy/simplify/trigsimp.pyc in futrig(e, **kwargs)
   1081 
   1082     old = e
-> 1083     e = bottom_up(e, lambda x: _futrig(x, **kwargs))
   1084 
   1085     if kwargs.pop('hyper', True) and e.has(HyperbolicFunction):

/home/aries/foss/sympy/sympy/simplify/simplify.pyc in bottom_up(rv, F, atoms, nonbasic)
    916             if args != rv.args:
    917                 rv = rv.func(*args)
--> 918             rv = F(rv)
    919         elif atoms:
    920             rv = F(rv)

/home/aries/foss/sympy/sympy/simplify/trigsimp.pyc in <lambda>(x)
   1081 
   1082     old = e
-> 1083     e = bottom_up(e, lambda x: _futrig(x, **kwargs))
   1084 
   1085     if kwargs.pop('hyper', True) and e.has(HyperbolicFunction):

/home/aries/foss/sympy/sympy/simplify/trigsimp.pyc in _futrig(e, **kwargs)
   1149             factor_terms, TR12(x), trigs)],  # expand tan of sum
   1150         )]
-> 1151     e = greedy(tree, objective=Lops)(e)
   1152 
   1153     return coeff*e

/home/aries/foss/sympy/sympy/strategies/core.pyc in minrule(expr)
    115     objective = kwargs.get('objective', identity)
    116     def minrule(expr):
--> 117         return min([rule(expr) for rule in rules], key=objective)
    118     return minrule

/home/aries/foss/sympy/sympy/strategies/core.pyc in chain_rl(expr)
     42     def chain_rl(expr):
     43         for rule in rules:
---> 44             expr = rule(expr)
     45         return expr
     46     return chain_rl

/home/aries/foss/sympy/sympy/simplify/fu.pyc in TR10i(rv)
    937         return rv
    938 
--> 939     return bottom_up(rv, f)
    940 
    941 

/home/aries/foss/sympy/sympy/simplify/simplify.pyc in bottom_up(rv, F, atoms, nonbasic)
    916             if args != rv.args:
    917                 rv = rv.func(*args)
--> 918             rv = F(rv)
    919         elif atoms:
    920             rv = F(rv)

/home/aries/foss/sympy/sympy/simplify/fu.pyc in f(rv)
    891 
    892         rv = process_common_addends(
--> 893             rv, do, lambda x: tuple(ordered(x.free_symbols)))
    894 
    895         # need to check for inducible pairs in ratio of sqrt(3):1 that

/home/aries/foss/sympy/sympy/simplify/fu.pyc in process_common_addends(rv, do, key2, key1)
   1757         if len(v) > 1:
   1758             e = Add(*v, evaluate=False)
-> 1759             new = do(e)
   1760             if new != e:
   1761                 e = new

/home/aries/foss/sympy/sympy/simplify/fu.pyc in do(rv, first)
    873 
    874             # two-arg Add
--> 875             split = trig_split(*args, two=True)
    876             if not split:
    877                 return rv

/home/aries/foss/sympy/sympy/simplify/fu.pyc in trig_split(a, b, two)
   1838         _roots()
   1839 
-> 1840     a, b = [Factors(i) for i in (a, b)]
   1841     ua, ub = a.normal(b)
   1842     gcd = a.gcd(b).as_expr()

/home/aries/foss/sympy/sympy/core/exprtools.py in __init__(self, factors)
    362                             raise ValueError('unexpected factor in i1: %s' % a)
    363 
--> 364         self.factors = factors
    365         try:
    366             self.gens = frozenset(factors.keys())

TypeError: descriptor 'factors' for 'Factors' objects doesn't apply to 'Factors' object