educoder的题目 辛苦大家帮我看看了 太感动了

Question

Answer 1

def fac(n):
    sum = 1
    for i in range(1, n):
        sum *= i
    return sum

def mycos(x, n = 10) :
    sum = 0
    for i in range(n + 1):
        sum += x ** (2 * i) * (-1 ** i)  / fac(2 * i)
    return sum