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q = H*sin[(t*Pi)/(2*A)]
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如果 0 ≤ t < A
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q = H
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如果 A≤ t < (1 – C)
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q = H*cos[(t + C – 1)*Pi/(2*C)]
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如果 (1 – C) ≤ t < (C + 1)
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q = –H
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如果 (C + 1) ≤ t < (2 – A)
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q = –H*cos[(t + A – 2)*Pi/(2*A)]
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如果 (2 – A) ≤ t < 2
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