def _eval_apply(self, arg):
arg = Basic.sympify(arg)
if isinstance(arg, Basic.Number):
if isinstance(arg, Basic.NaN):
return S.NaN
elif isinstance(arg, Basic.Infinity):
return S.One
elif isinstance(arg, Basic.NegativeInfinity):
return S.NegativeOne
elif isinstance(arg, Basic.Zero):
return S.Zero
elif arg.is_negative:
return -self(-arg)
else:
i_coeff = arg.as_coefficient(S.ImaginaryUnit)
if i_coeff is not None:
return S.ImaginaryUnit * Basic.tan(i_coeff)
else:
coeff, terms = arg.as_coeff_terms()
if coeff.is_negative:
return -self(-arg)
