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Function Limit and Sum of Number Series

数列极限和函数求和

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limit(f(x), x, a)            # 当x->a时,f(x)的极限
limit(f(x)) # 当x->0时,f(x)的极限
limit(f(x), x, a, 'left') # 当x->a-时,f(x)的极限

inf

级数求和

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symsum(s, v, a, b)            # 表达式s关于变量v从a到b求和

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