Good, so if I plug q2 = 0 into here, this term disappears and I just get a - c over 2b.

把q2=0代入到算式中,这部分就没有了,只剩/2b

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You'll put time t=0, x doesn't have this term, doesn't have this term, and it is c.

你令时间t=0,这一项就消失了,这一项也是,只剩下常数c

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