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Summa Summarum | Summa Summarum #5

Neka je P polinom s racionalnim koeficijentima takav da P(\pi)=\sum_{n=1}^{\infty} \frac{cos(n)}{n^4} Nađi vrijednost od P(4)

Let P be a polynomial with rational coefficients such that P(\pi)=\sum_{n=1}^{\infty} \frac{cos(n)}{n^4} Find the value of P(4)