1/(log 2) + 1/(log 2)(log 3) + 1/(log 2)(log 3)(log 4) + ... 1/(sin²1)² + 1/(sin²1+sin²2)² + 1/(sin²1+sin²2+sin²3)² + 1/(sin²1+sin²2+sin²3+sin²4)² + ...
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