Python let's you shoot yourself in the foot by erasing functions. So when you import from abc first you get the variable named N and then the evalf alias when you import * from sympy (erasing the variable) and vice versa when you reverse the sequence. To recover N just "from sympy import N". Also note that the mnemonic for single-letter-named functions is COSINE-Q. Those single letters, when imported from sympy, have a non-Symbol meaning.
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