[REVISED] 21st June 2026 - Hard Daily Integral
method: analyse the upper and lower limits of the fractional part function, and express the fractional part in terms of the original function use a sin^2 substitution for the first integral summation-by-parts for the summation, then apply euler's product
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[REVISED] 15th June 2026 - Hard Daily Integral
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[REVISED] 13th June 2026 - Hard Daily Integral
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