Find the half-range cosine series for the function f(x) = x(n - r) in o<r<n. Deduce...

Find the half-range cosine series for the function f(x) = x(n - r) in o<r<n. Deduce that 1/1⁴+1/2⁴+1/3^4+…. =π⁴/90.

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milcah answered 1 year ago

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