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from sympy import sin, cos, exp, E, series, oo, S, Derivative, O, Integral, \
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Function, log, sqrt, Symbol, Subs
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Function, log, sqrt, Symbol, Subs, pi, symbols
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from sympy.abc import x, y, n, k
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from sympy.utilities.pytest import raises
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from sympy.series.gruntz import calculate_series