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SymPy学习笔记, python, sympy, Symbol, CAS
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python_sympy.md

SymPy是一个用来处理数学符号的Python库，一个计算机代数系统(Computer Algebra System, CAS)。

from sympy import Symbol, symbols
from sympy import limit, sin, cos, pi, oo
from sympy import simplify, expand


# 求极限，(1+1/n)^n趋于无穷大时的极限(极限值为欧拉数e)
n = Symbol('n')
f = lambda n: (1 + 1/n)**n
limit(f(n), n, oo)

# 表达式展开，求(x+y)^2的二项式展开
x, y = symbols('x, y')
expand((x + y)**2)

# 表达式化简
simplify(sin(x)**2 + cos(x)**2)
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