error_functions.py 文件源码

def taylor_term(n, x, *previous_terms):
        if n < 0:
            return S.Zero
        else:
            x = sympify(x)
            if len(previous_terms) > 1:
                p = previous_terms[-1]
                return (-pi**2*x**4*(4*n - 3)/(8*n*(2*n - 1)*(4*n + 1))) * p
            else:
                return x * (-x**4)**n * (S(2)**(-2*n)*pi**(2*n)) / ((4*n + 1)*C.factorial(2*n))