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In [2]: sin(a+b)

TypeErrorTraceback (most recent call last)
<ipython-input-134-61fcf5bf485f> in <module>()
----> 1 sin(a+b)

/Users/Library/Enthought/Canopy/edm/envs/User/lib/python2.7/site- 
packages/sympy/core/expr.py in __float__(self)
224         if result.is_number and result.as_real_imag()[1]:
225             raise TypeError("can't convert complex to float")
--> 226         raise TypeError("can't convert expression to float")
227 
228     def __complex__(self):
TypeError: can't convert expression to float