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[初賽第二階段] 三角函數（1） [Preliminary Phase 2] Trigonometric Functions (1)

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[初賽第二階段] 三角函數（2） [Preliminary Phase 2] Trigonometric Functions (2)

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[初賽第二階段] 級數與近似（1） [Preliminary Phase 2] Series and Approximations (1)