# The Basel Problem II

Calculus Level 2

The great mathematician Leonhard Euler prove in 1735 that $$\sum_{n=1}^{\infty }\frac{1}{n^{2}}=\frac{\pi ^{2}}{6}$$

Then, $$\sum_{n=1}^{\infty }\frac{1}{n^{4}}$$ is...

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