Here is the first derivative:
f'(k) = d/dk [k * f(k-1) + an] = f(k-1) + k * f'(k-1)
Here is the second derivative:
f''(k) = f'(k-1) + k * f''(k-1)
 นี่คืออนุพันธ์อันดับหนึ่ง: f'(k) = d/dk [k * f(k-1) + an] = f(k-1) + k * f'(k-1) นี่คืออนุพันธ์อันดับสอง: ฉ''(k) = ฉ'(k-1) + k * f''(k-1)
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