y=anxn+an−1xn−1+⋯+a0x0+by = a_nx_n + a_{n-1}x_{n-1} + \cdots + a_0x_0 + by=anxn+an−1xn−1+⋯+a0x0+b
tn=tn−1t_n = t_{n-1}tn=tn−1
tn=17∑i=n−7n−1tit_n = \frac{1}{7} \sum_{i=n-7}^{n-1} t_itn=71i=n−7∑n−1ti
tn=1W∑i=n−Wn−1tit_n = \frac{1}{W} \sum_{i=n-W}^{n-1} t_itn=W1i=n−W∑n−1ti
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